# NSError Codes Error codes in the Cocoa error domain. ## Discussion The constants in this enumeration are [`NSError`](/documentation/Foundation/NSError) code numbers in the Cocoa error domain ([`NSCocoaErrorDomain`](/documentation/Foundation/NSCocoaErrorDomain)). Other frameworks, most notably the Application Kit, provide their own [`NSCocoaErrorDomain`](/documentation/Foundation/NSCocoaErrorDomain) error codes. The enumeration constants beginning with `NSFile` indicate file-system errors or errors related to file I/O operations. Use the key [`NSFilePathErrorKey`](/documentation/Foundation/NSFilePathErrorKey) or the [`NSURLErrorKey`](/documentation/Foundation/NSURLErrorKey) (whichever is appropriate) to access the file-system path or URL in the [`userInfo`](/documentation/Foundation/NSError/userInfo) dictionary of the [`NSError`](/documentation/Foundation/NSError) object. ## Topics ### Bundle Errors [`NSBundleErrorMinimum`](/documentation/Foundation/NSBundleErrorMinimum-swift.var) The start of the range of error codes reserved for bundle errors. [`NSBundleErrorMaximum`](/documentation/Foundation/NSBundleErrorMaximum-swift.var) The end of the range of error codes reserved for bundle errors. [`NSBundleOnDemandResourceExceededMaximumSizeError`](/documentation/Foundation/NSBundleOnDemandResourceExceededMaximumSizeError-swift.var) The application exceeded the amount of on-demand resources content in use at one time. [`NSBundleOnDemandResourceInvalidTagError`](/documentation/Foundation/NSBundleOnDemandResourceInvalidTagError-swift.var) The application specified a tag that the system couldn’t find in the application tag manifest. [`NSBundleOnDemandResourceOutOfSpaceError`](/documentation/Foundation/NSBundleOnDemandResourceOutOfSpaceError-swift.var) Insufficient space available to download the requested on-demand resources. ### Cancellation [`NSUserCancelledError`](/documentation/Foundation/NSUserCancelledError-swift.var) The user canceled the operation (for example, by pressing Command-period). ### Cloud-Sharing Errors [`NSCloudSharingErrorMinimum`](/documentation/Foundation/NSCloudSharingErrorMinimum-swift.var) The start of the range of error codes reserved for cloud-sharing errors. [`NSCloudSharingErrorMaximum`](/documentation/Foundation/NSCloudSharingErrorMaximum-swift.var) The end of the range of error codes reserved for cloud-sharing errors. [`NSCloudSharingConflictError`](/documentation/Foundation/NSCloudSharingConflictError-swift.var) A conflict occurred during an attempt to save changes. [`NSCloudSharingNetworkFailureError`](/documentation/Foundation/NSCloudSharingNetworkFailureError-swift.var) Sharing failed due to a network failure. [`NSCloudSharingNoPermissionError`](/documentation/Foundation/NSCloudSharingNoPermissionError-swift.var) The current user doesn’t have permission to perform the requested actions. [`NSCloudSharingOtherError`](/documentation/Foundation/NSCloudSharingOtherError-swift.var) An otherwise unspecified cloud-sharing error occurred. [`NSCloudSharingQuotaExceededError`](/documentation/Foundation/NSCloudSharingQuotaExceededError-swift.var) The user doesn’t have enough storage space available to share the requested items. [`NSCloudSharingTooManyParticipantsError`](/documentation/Foundation/NSCloudSharingTooManyParticipantsError-swift.var) Additional participants couldn’t be added to the share, because the limit was reached. ### Coder Errors [`NSCoderErrorMinimum`](/documentation/Foundation/NSCoderErrorMinimum-swift.var) The start of the range of error codes reserved for coder errors. [`NSCoderErrorMaximum`](/documentation/Foundation/NSCoderErrorMaximum-swift.var) The end of the range of error codes reserved for coder errors. [`NSCoderValueNotFoundError`](/documentation/Foundation/NSCoderValueNotFoundError-swift.var) The requested data wasn’t found. [`NSCoderReadCorruptError`](/documentation/Foundation/NSCoderReadCorruptError-swift.var) Decoding failed due to corrupt data. ### Executable Errors [`NSExecutableErrorMinimum`](/documentation/Foundation/NSExecutableErrorMinimum-swift.var) The beginning of the range of error codes reserved for errors related to executable files. [`NSExecutableErrorMaximum`](/documentation/Foundation/NSExecutableErrorMaximum-swift.var) The end of the range of error codes reserved for errors related to executable files. [`NSExecutableArchitectureMismatchError`](/documentation/Foundation/NSExecutableArchitectureMismatchError-swift.var) The executable doesn’t provide an architecture compatible with the current process. [`NSExecutableLinkError`](/documentation/Foundation/NSExecutableLinkError-swift.var) The executable failed due to linking issues. [`NSExecutableLoadError`](/documentation/Foundation/NSExecutableLoadError-swift.var) Executable cannot be loaded for an otherwise-unspecified reason. [`NSExecutableNotLoadableError`](/documentation/Foundation/NSExecutableNotLoadableError-swift.var) The executable type isn’t loadable in the current process. [`NSExecutableRuntimeMismatchError`](/documentation/Foundation/NSExecutableRuntimeMismatchError-swift.var) The executable has Objective-C runtime information that’s incompatible with the current process. ### Formatting Errors [`NSFormattingErrorMinimum`](/documentation/Foundation/NSFormattingErrorMinimum-swift.var) The start of the range of error codes reserved for formatting errors. [`NSFormattingErrorMaximum`](/documentation/Foundation/NSFormattingErrorMaximum-swift.var) The end of the range of error codes reserved for formatting errors. [`NSFormattingError`](/documentation/Foundation/NSFormattingError-swift.var) A formatter couldn’t generate a string for an object, or parse a string into an object. ### File Errors [`NSFileErrorMinimum`](/documentation/Foundation/NSFileErrorMinimum-swift.var) The start of the range of error codes reserved for file errors. [`NSFileErrorMaximum`](/documentation/Foundation/NSFileErrorMaximum-swift.var) The end of the range of error codes reserved for file errors. [`NSFileLockingError`](/documentation/Foundation/NSFileLockingError-swift.var) The file could not be locked. [`NSFileManagerUnmountBusyError`](/documentation/Foundation/NSFileManagerUnmountBusyError-swift.var) The volume couldn’t be unmounted because it’s in use. [`NSFileManagerUnmountUnknownError`](/documentation/Foundation/NSFileManagerUnmountUnknownError-swift.var) The volume couldn’t be unmounted, for unknown reasons. [`NSFileNoSuchFileError`](/documentation/Foundation/NSFileNoSuchFileError-swift.var) A filesystem operation was attempted on a non-existent file. ### File Reading Errors [`NSFileReadCorruptFileError`](/documentation/Foundation/NSFileReadCorruptFileError-swift.var) Could not read because of a corrupted file, bad format, or similar reason. [`NSFileReadInapplicableStringEncodingError`](/documentation/Foundation/NSFileReadInapplicableStringEncodingError-swift.var) Could not read because the string encoding wasn’t applicable. [`NSFileReadInvalidFileNameError`](/documentation/Foundation/NSFileReadInvalidFileNameError-swift.var) Could not read because of an invalid file name. [`NSFileReadNoPermissionError`](/documentation/Foundation/NSFileReadNoPermissionError-swift.var) Could not read because of a permission problem. [`NSFileReadNoSuchFileError`](/documentation/Foundation/NSFileReadNoSuchFileError-swift.var) Could not read because no such file was found. [`NSFileReadTooLargeError`](/documentation/Foundation/NSFileReadTooLargeError-swift.var) Could not read because the specified file was too large. [`NSFileReadUnknownError`](/documentation/Foundation/NSFileReadUnknownError-swift.var) Could not read, for unknown reasons. [`NSFileReadUnknownStringEncodingError`](/documentation/Foundation/NSFileReadUnknownStringEncodingError-swift.var) Could not read because the string coding of the file couldn’t be determined. [`NSFileReadUnsupportedSchemeError`](/documentation/Foundation/NSFileReadUnsupportedSchemeError-swift.var) Could not read because the specified URL scheme is unsupported. ### File Writing Errors [`NSFileWriteFileExistsError`](/documentation/Foundation/NSFileWriteFileExistsError-swift.var) Could not perform an operation because the destination file already exists. [`NSFileWriteInapplicableStringEncodingError`](/documentation/Foundation/NSFileWriteInapplicableStringEncodingError-swift.var) Could not write because the string encoding was not applicable. [`NSFileWriteInvalidFileNameError`](/documentation/Foundation/NSFileWriteInvalidFileNameError-swift.var) Could not write because of an invalid file name. [`NSFileWriteNoPermissionError`](/documentation/Foundation/NSFileWriteNoPermissionError-swift.var) Could not write because of a permission problem. [`NSFileWriteOutOfSpaceError`](/documentation/Foundation/NSFileWriteOutOfSpaceError-swift.var) Could not write because of a lack of disk space. [`NSFileWriteUnknownError`](/documentation/Foundation/NSFileWriteUnknownError-swift.var) Could not write, for unknown reasons. [`NSFileWriteUnsupportedSchemeError`](/documentation/Foundation/NSFileWriteUnsupportedSchemeError-swift.var) Could not write because the specified URL scheme is unsupported. [`NSFileWriteVolumeReadOnlyError`](/documentation/Foundation/NSFileWriteVolumeReadOnlyError-swift.var) Could not write because the volume is read-only. ### iCloud File Errors [`NSUbiquitousFileErrorMinimum`](/documentation/Foundation/NSUbiquitousFileErrorMinimum-swift.var) The minimum error code value that represents an iCloud error. [`NSUbiquitousFileErrorMaximum`](/documentation/Foundation/NSUbiquitousFileErrorMaximum-swift.var) The maximum error code value that represents an iCloud error. [`NSUbiquitousFileNotUploadedDueToQuotaError`](/documentation/Foundation/NSUbiquitousFileNotUploadedDueToQuotaError-swift.var) The item could not be uploaded to iCloud because it would make the account go over its quota. [`NSUbiquitousFileUbiquityServerNotAvailable`](/documentation/Foundation/NSUbiquitousFileUbiquityServerNotAvailable-swift.var) A failure to connect to the iCloud servers. [`NSUbiquitousFileUnavailableError`](/documentation/Foundation/NSUbiquitousFileUnavailableError-swift.var) The item has not been uploaded to iCloud by another device yet. ### Property List Errors [`NSPropertyListErrorMinimum`](/documentation/Foundation/NSPropertyListErrorMinimum-swift.var) The start of the range of error codes reserved for property list errors. [`NSPropertyListErrorMaximum`](/documentation/Foundation/NSPropertyListErrorMaximum-swift.var) The end of the range of error codes reserved for property list errors. [`NSPropertyListReadCorruptError`](/documentation/Foundation/NSPropertyListReadCorruptError-swift.var) Parsing of the property list failed. [`NSPropertyListReadStreamError`](/documentation/Foundation/NSPropertyListReadStreamError-swift.var) Reading of the property list failed. [`NSPropertyListReadUnknownVersionError`](/documentation/Foundation/NSPropertyListReadUnknownVersionError-swift.var) The version number of the property list cannot be determined. [`NSPropertyListWriteInvalidError`](/documentation/Foundation/NSPropertyListWriteInvalidError-swift.var) Writing failed because of an invalid property list object, or an invalid property list type was specified. [`NSPropertyListWriteStreamError`](/documentation/Foundation/NSPropertyListWriteStreamError-swift.var) Writing to the property list failed. ### User Activity Errors [`NSUserActivityErrorMinimum`](/documentation/Foundation/NSUserActivityErrorMinimum-swift.var) The start of the range of error codes reserved for user activity errors. [`NSUserActivityErrorMaximum`](/documentation/Foundation/NSUserActivityErrorMaximum-swift.var) The end of the range of error codes reserved for user activity errors. [`NSUserActivityConnectionUnavailableError`](/documentation/Foundation/NSUserActivityConnectionUnavailableError-swift.var) The user activity couldn’t be continued because a required connection wasn’t available. [`NSUserActivityHandoffFailedError`](/documentation/Foundation/NSUserActivityHandoffFailedError-swift.var) The data for the user activity wasn’t available. [`NSUserActivityHandoffUserInfoTooLargeError`](/documentation/Foundation/NSUserActivityHandoffUserInfoTooLargeError-swift.var) The user info dictionary was too large to receive. [`NSUserActivityRemoteApplicationTimedOutError`](/documentation/Foundation/NSUserActivityRemoteApplicationTimedOutError-swift.var) The remote application failed to send data within the specified time. ### Validation Errors [`NSValidationErrorMinimum`](/documentation/Foundation/NSValidationErrorMinimum-swift.var) The start of the range of error codes reserved for validation errors. [`NSValidationErrorMaximum`](/documentation/Foundation/NSValidationErrorMaximum-swift.var) The end of the range of error codes reserved for validation errors. ### XPC Errors [`NSXPCConnectionErrorMinimum`](/documentation/Foundation/NSXPCConnectionErrorMinimum-swift.var) The lower bounds of XPC connection error code values. [`NSXPCConnectionErrorMaximum`](/documentation/Foundation/NSXPCConnectionErrorMaximum-swift.var) The upper bounds of XPC connection error code values. [`NSXPCConnectionInterrupted`](/documentation/Foundation/NSXPCConnectionInterrupted-swift.var) The XPC connection was interrupted. [`NSXPCConnectionInvalid`](/documentation/Foundation/NSXPCConnectionInvalid-swift.var) The XPC connection was invalid. [`NSXPCConnectionReplyInvalid`](/documentation/Foundation/NSXPCConnectionReplyInvalid-swift.var) The XPC connection reply was invalid. ### URL Errors [`NSURLErrorAppTransportSecurityRequiresSecureConnection`](/documentation/Foundation/NSURLErrorAppTransportSecurityRequiresSecureConnection-swift.var) App Transport Security disallowed a connection because there is no secure network connection. [`NSURLErrorBackgroundSessionInUseByAnotherProcess`](/documentation/Foundation/NSURLErrorBackgroundSessionInUseByAnotherProcess-swift.var) An app or app extension attempted to connect to a background session that is already connected to a process. [`NSURLErrorBackgroundSessionRequiresSharedContainer`](/documentation/Foundation/NSURLErrorBackgroundSessionRequiresSharedContainer-swift.var) The shared container identifier of the URL session configuration is needed but hasn’t been set. [`NSURLErrorBackgroundSessionWasDisconnected`](/documentation/Foundation/NSURLErrorBackgroundSessionWasDisconnected-swift.var) The app is suspended or exits while a background data task is processing. [`NSURLErrorBadServerResponse`](/documentation/Foundation/NSURLErrorBadServerResponse-swift.var) The URL Loading System received bad data from the server. [`NSURLErrorBadURL`](/documentation/Foundation/NSURLErrorBadURL-swift.var) A malformed URL prevented a URL request from being initiated. [`NSURLErrorCallIsActive`](/documentation/Foundation/NSURLErrorCallIsActive-swift.var) A connection was attempted while a phone call was active on a network that doesn’t support simultaneous phone and data communication, such as EDGE or GPRS. [`NSURLErrorCancelled`](/documentation/Foundation/NSURLErrorCancelled-swift.var) An asynchronous load has been canceled. [`NSURLErrorCannotCloseFile`](/documentation/Foundation/NSURLErrorCannotCloseFile-swift.var) A download task couldn’t close the downloaded file on disk. [`NSURLErrorCannotConnectToHost`](/documentation/Foundation/NSURLErrorCannotConnectToHost-swift.var) An attempt to connect to a host failed. [`NSURLErrorCannotCreateFile`](/documentation/Foundation/NSURLErrorCannotCreateFile-swift.var) A download task couldn’t create the downloaded file on disk because of an I/O failure. [`NSURLErrorCannotDecodeContentData`](/documentation/Foundation/NSURLErrorCannotDecodeContentData-swift.var) Content data received during a connection request had an unknown content encoding. [`NSURLErrorCannotDecodeRawData`](/documentation/Foundation/NSURLErrorCannotDecodeRawData-swift.var) Content data received during a connection request couldn’t be decoded for a known content encoding. [`NSURLErrorCannotFindHost`](/documentation/Foundation/NSURLErrorCannotFindHost-swift.var) The host name for a URL couldn’t be resolved. [`NSURLErrorCannotLoadFromNetwork`](/documentation/Foundation/NSURLErrorCannotLoadFromNetwork-swift.var) A specific request to load an item only from the cache couldn’t be satisfied. [`NSURLErrorCannotMoveFile`](/documentation/Foundation/NSURLErrorCannotMoveFile-swift.var) A downloaded file on disk couldn’t be moved. [`NSURLErrorCannotOpenFile`](/documentation/Foundation/NSURLErrorCannotOpenFile-swift.var) A downloaded file on disk couldn’t be opened. [`NSURLErrorCannotParseResponse`](/documentation/Foundation/NSURLErrorCannotParseResponse-swift.var) A response to a connection request couldn’t be parsed. [`NSURLErrorCannotRemoveFile`](/documentation/Foundation/NSURLErrorCannotRemoveFile-swift.var) A downloaded file couldn’t be removed from disk. [`NSURLErrorCannotWriteToFile`](/documentation/Foundation/NSURLErrorCannotWriteToFile-swift.var) A download task couldn’t write the file to disk. [`NSURLErrorClientCertificateRejected`](/documentation/Foundation/NSURLErrorClientCertificateRejected-swift.var) A server certificate was rejected. [`NSURLErrorClientCertificateRequired`](/documentation/Foundation/NSURLErrorClientCertificateRequired-swift.var) A client certificate was required to authenticate an SSL connection during a connection request. [`NSURLErrorDNSLookupFailed`](/documentation/Foundation/NSURLErrorDNSLookupFailed-swift.var) The host address couldn’t be found via DNS lookup. [`NSURLErrorDataLengthExceedsMaximum`](/documentation/Foundation/NSURLErrorDataLengthExceedsMaximum-swift.var) The length of the resource data exceeded the maximum allowed. [`NSURLErrorDataNotAllowed`](/documentation/Foundation/NSURLErrorDataNotAllowed-swift.var) The cellular network disallowed a connection. [`NSURLErrorDownloadDecodingFailedMidStream`](/documentation/Foundation/NSURLErrorDownloadDecodingFailedMidStream-swift.var) A download task failed to decode an encoded file during the download. [`NSURLErrorDownloadDecodingFailedToComplete`](/documentation/Foundation/NSURLErrorDownloadDecodingFailedToComplete-swift.var) A download task failed to decode an encoded file after downloading. [`NSURLErrorFileDoesNotExist`](/documentation/Foundation/NSURLErrorFileDoesNotExist-swift.var) The specified file doesn’t exist. [`NSURLErrorFileIsDirectory`](/documentation/Foundation/NSURLErrorFileIsDirectory-swift.var) A request for an FTP file resulted in the server responding that the file is not a plain file, but a directory. [`NSURLErrorFileOutsideSafeArea`](/documentation/Foundation/NSURLErrorFileOutsideSafeArea-swift.var) An internal file operation failed. [`NSURLErrorHTTPTooManyRedirects`](/documentation/Foundation/NSURLErrorHTTPTooManyRedirects-swift.var) A redirect loop was detected or the threshold for number of allowable redirects was exceeded (currently 16). [`NSURLErrorInternationalRoamingOff`](/documentation/Foundation/NSURLErrorInternationalRoamingOff-swift.var) The attempted connection required activating a data context while roaming, but international roaming is disabled. [`NSURLErrorNetworkConnectionLost`](/documentation/Foundation/NSURLErrorNetworkConnectionLost-swift.var) A client or server connection was severed in the middle of an in-progress load. [`NSURLErrorNoPermissionsToReadFile`](/documentation/Foundation/NSURLErrorNoPermissionsToReadFile-swift.var) A resource couldn’t be read because of insufficient permissions. [`NSURLErrorNotConnectedToInternet`](/documentation/Foundation/NSURLErrorNotConnectedToInternet-swift.var) A network resource was requested, but an internet connection has not been established and can’t be established automatically. [`NSURLErrorRedirectToNonExistentLocation`](/documentation/Foundation/NSURLErrorRedirectToNonExistentLocation-swift.var) A redirect was specified by way of server response code, but the server didn’t accompany this code with a redirect URL. [`NSURLErrorRequestBodyStreamExhausted`](/documentation/Foundation/NSURLErrorRequestBodyStreamExhausted-swift.var) A body stream was needed but the client did not provide one. [`NSURLErrorResourceUnavailable`](/documentation/Foundation/NSURLErrorResourceUnavailable-swift.var) A requested resource couldn’t be retrieved. [`NSURLErrorSecureConnectionFailed`](/documentation/Foundation/NSURLErrorSecureConnectionFailed-swift.var) An attempt to establish a secure connection failed for reasons that can’t be expressed more specifically. [`NSURLErrorServerCertificateHasBadDate`](/documentation/Foundation/NSURLErrorServerCertificateHasBadDate-swift.var) A server certificate is expired, or is not yet valid. [`NSURLErrorServerCertificateHasUnknownRoot`](/documentation/Foundation/NSURLErrorServerCertificateHasUnknownRoot-swift.var) A server certificate wasn’t signed by any root server. [`NSURLErrorServerCertificateNotYetValid`](/documentation/Foundation/NSURLErrorServerCertificateNotYetValid-swift.var) A server certificate isn’t valid yet. [`NSURLErrorServerCertificateUntrusted`](/documentation/Foundation/NSURLErrorServerCertificateUntrusted-swift.var) A server certificate was signed by a root server that isn’t trusted. [`NSURLErrorTimedOut`](/documentation/Foundation/NSURLErrorTimedOut-swift.var) An asynchronous operation timed out. [`NSURLErrorUnknown`](/documentation/Foundation/NSURLErrorUnknown-swift.var) The URL Loading System encountered an error that it can’t interpret. [`NSURLErrorUnsupportedURL`](/documentation/Foundation/NSURLErrorUnsupportedURL-swift.var) A properly formed URL couldn’t be handled by the framework. [`NSURLErrorUserAuthenticationRequired`](/documentation/Foundation/NSURLErrorUserAuthenticationRequired-swift.var) Authentication was required to access a resource. [`NSURLErrorUserCancelledAuthentication`](/documentation/Foundation/NSURLErrorUserCancelledAuthentication-swift.var) An asynchronous request for authentication has been canceled by the user. [`NSURLErrorZeroByteResource`](/documentation/Foundation/NSURLErrorZeroByteResource-swift.var) A server reported that a URL has a non-zero content length, but terminated the network connection gracefully without sending any data. ### Miscellaneous Errors [`NSFeatureUnsupportedError`](/documentation/Foundation/NSFeatureUnsupportedError-swift.var) The feature isn’t supported, because the file system lacks the feature, or required libraries are missing, or other similar reasons. [`NSKeyValueValidationError`](/documentation/Foundation/NSKeyValueValidationError-swift.var) A key-value coding validation error. ### Bundle Errors [`NSBundleErrorMinimum`](/documentation/Foundation/NSBundleErrorMinimum-c.enum.case) The start of the range of error codes reserved for bundle errors. [`NSBundleErrorMaximum`](/documentation/Foundation/NSBundleErrorMaximum-c.enum.case) The end of the range of error codes reserved for bundle errors. [`NSBundleOnDemandResourceExceededMaximumSizeError`](/documentation/Foundation/NSBundleOnDemandResourceExceededMaximumSizeError-c.enum.case) The application exceeded the amount of on-demand resources content in use at one time. [`NSBundleOnDemandResourceInvalidTagError`](/documentation/Foundation/NSBundleOnDemandResourceInvalidTagError-c.enum.case) The application specified a tag that the system couldn’t find in the application tag manifest. [`NSBundleOnDemandResourceOutOfSpaceError`](/documentation/Foundation/NSBundleOnDemandResourceOutOfSpaceError-c.enum.case) Insufficient space available to download the requested On Demand Resources. ### Cancellation [`NSUserCancelledError`](/documentation/Foundation/NSUserCancelledError-c.enum.case) The user canceled the operation (for example, by pressing Command-period). ### Cloud-Sharing Errors [`NSCloudSharingErrorMinimum`](/documentation/Foundation/NSCloudSharingErrorMinimum-c.enum.case) The start of the range of error codes reserved for cloud-sharing errors. [`NSCloudSharingErrorMaximum`](/documentation/Foundation/NSCloudSharingErrorMaximum-c.enum.case) The end of the range of error codes reserved for cloud-sharing errors. [`NSCloudSharingConflictError`](/documentation/Foundation/NSCloudSharingConflictError-c.enum.case) A conflict occurred during an attempt to save changes. [`NSCloudSharingNetworkFailureError`](/documentation/Foundation/NSCloudSharingNetworkFailureError-c.enum.case) Sharing failed due to a network failure. [`NSCloudSharingNoPermissionError`](/documentation/Foundation/NSCloudSharingNoPermissionError-c.enum.case) The current user doesn’t have permission to perform the requested actions. [`NSCloudSharingOtherError`](/documentation/Foundation/NSCloudSharingOtherError-c.enum.case) An otherwise unspecified cloud-sharing error occurred. [`NSCloudSharingQuotaExceededError`](/documentation/Foundation/NSCloudSharingQuotaExceededError-c.enum.case) The user doesn’t have enough storage space available to share the requested items. [`NSCloudSharingTooManyParticipantsError`](/documentation/Foundation/NSCloudSharingTooManyParticipantsError-c.enum.case) Additional participants couldn’t be added to the share, because the limit was reached. ### Coder Errors [`NSCoderErrorMinimum`](/documentation/Foundation/NSCoderErrorMinimum-c.enum.case) The start of the range of error codes reserved for coder errors. [`NSCoderErrorMaximum`](/documentation/Foundation/NSCoderErrorMaximum-c.enum.case) The end of the range of error codes reserved for coder errors. [`NSCoderValueNotFoundError`](/documentation/Foundation/NSCoderValueNotFoundError-c.enum.case) The requested data wasn’t found. [`NSCoderReadCorruptError`](/documentation/Foundation/NSCoderReadCorruptError-c.enum.case) Decoding failed due to corrupt data. [`NSCoderInvalidValueError`](/documentation/Foundation/NSCoderInvalidValueError-c.enum.case) Data wasn’t valid to encode. ### Executable Errors [`NSExecutableErrorMinimum`](/documentation/Foundation/NSExecutableErrorMinimum-c.enum.case) The beginning of the range of error codes reserved for errors related to executable files. [`NSExecutableErrorMaximum`](/documentation/Foundation/NSExecutableErrorMaximum-c.enum.case) The end of the range of error codes reserved for errors related to executable files. [`NSExecutableArchitectureMismatchError`](/documentation/Foundation/NSExecutableArchitectureMismatchError-c.enum.case) The executable doesn’t provide an architecture compatible with the current process. [`NSExecutableLinkError`](/documentation/Foundation/NSExecutableLinkError-c.enum.case) The executable failed due to linking issues. [`NSExecutableLoadError`](/documentation/Foundation/NSExecutableLoadError-c.enum.case) Executable cannot be loaded for an otherwise-unspecified reason. [`NSExecutableNotLoadableError`](/documentation/Foundation/NSExecutableNotLoadableError-c.enum.case) The executable type isn’t loadable in the current process. [`NSExecutableRuntimeMismatchError`](/documentation/Foundation/NSExecutableRuntimeMismatchError-c.enum.case) The executable has Objective-C runtime information that’s incompatible with the current process. ### Formatting Errors [`NSFormattingErrorMinimum`](/documentation/Foundation/NSFormattingErrorMinimum-c.enum.case) The start of the range of error codes reserved for formatting errors. [`NSFormattingErrorMaximum`](/documentation/Foundation/NSFormattingErrorMaximum-c.enum.case) The end of the range of error codes reserved for formatting errors. [`NSFormattingError`](/documentation/Foundation/NSFormattingError-c.enum.case) A formatter couldn’t generate a string for an object, or parse a string into an object. ### File Errors [`NSFileErrorMinimum`](/documentation/Foundation/NSFileErrorMinimum-c.enum.case) The start of the range of error codes reserved for file errors. [`NSFileErrorMaximum`](/documentation/Foundation/NSFileErrorMaximum-c.enum.case) The end of the range of error codes reserved for file errors. [`NSFileLockingError`](/documentation/Foundation/NSFileLockingError-c.enum.case) The file could not be locked. [`NSFileManagerUnmountBusyError`](/documentation/Foundation/NSFileManagerUnmountBusyError-c.enum.case) The volume couldn’t be unmounted because it’s in use. [`NSFileManagerUnmountUnknownError`](/documentation/Foundation/NSFileManagerUnmountUnknownError-c.enum.case) The volume couldn’t be unmounted, for unknown reasons. [`NSFileNoSuchFileError`](/documentation/Foundation/NSFileNoSuchFileError-c.enum.case) A filesystem operation was attempted on a non-existent file. ### File Reading Errors [`NSFileReadCorruptFileError`](/documentation/Foundation/NSFileReadCorruptFileError-c.enum.case) Could not read because of a corrupted file, bad format, or similar reason. [`NSFileReadInapplicableStringEncodingError`](/documentation/Foundation/NSFileReadInapplicableStringEncodingError-c.enum.case) Could not read because the string encoding wasn’t applicable. [`NSFileReadInvalidFileNameError`](/documentation/Foundation/NSFileReadInvalidFileNameError-c.enum.case) Could not read because of an invalid file name. [`NSFileReadNoPermissionError`](/documentation/Foundation/NSFileReadNoPermissionError-c.enum.case) Could not read because of a permission problem. [`NSFileReadNoSuchFileError`](/documentation/Foundation/NSFileReadNoSuchFileError-c.enum.case) Could not read because no such file was found. [`NSFileReadTooLargeError`](/documentation/Foundation/NSFileReadTooLargeError-c.enum.case) Could not read because the specified file was too large. [`NSFileReadUnknownError`](/documentation/Foundation/NSFileReadUnknownError-c.enum.case) Could not read, for unknown reasons. [`NSFileReadUnknownStringEncodingError`](/documentation/Foundation/NSFileReadUnknownStringEncodingError-c.enum.case) Could not read because the string coding of the file couldn’t be determined. [`NSFileReadUnsupportedSchemeError`](/documentation/Foundation/NSFileReadUnsupportedSchemeError-c.enum.case) Could not read because the specified URL scheme is unsupported. ### File Writing Errors [`NSFileWriteFileExistsError`](/documentation/Foundation/NSFileWriteFileExistsError-c.enum.case) Could not perform an operation because the destination file already exists. [`NSFileWriteInapplicableStringEncodingError`](/documentation/Foundation/NSFileWriteInapplicableStringEncodingError-c.enum.case) Could not write because the string encoding was not applicable. [`NSFileWriteInvalidFileNameError`](/documentation/Foundation/NSFileWriteInvalidFileNameError-c.enum.case) Could not write because of an invalid file name. [`NSFileWriteNoPermissionError`](/documentation/Foundation/NSFileWriteNoPermissionError-c.enum.case) Could not write because of a permission problem. [`NSFileWriteOutOfSpaceError`](/documentation/Foundation/NSFileWriteOutOfSpaceError-c.enum.case) Could not write because of a lack of disk space. [`NSFileWriteUnknownError`](/documentation/Foundation/NSFileWriteUnknownError-c.enum.case) Could not write, for unknown reasons. [`NSFileWriteUnsupportedSchemeError`](/documentation/Foundation/NSFileWriteUnsupportedSchemeError-c.enum.case) Could not write because the specified URL scheme is unsupported. [`NSFileWriteVolumeReadOnlyError`](/documentation/Foundation/NSFileWriteVolumeReadOnlyError-c.enum.case) Could not write because the volume is read-only. ### iCloud File Errors [`NSUbiquitousFileErrorMinimum`](/documentation/Foundation/NSUbiquitousFileErrorMinimum-c.enum.case) The minimum error code value that represents an iCloud error. [`NSUbiquitousFileErrorMaximum`](/documentation/Foundation/NSUbiquitousFileErrorMaximum-c.enum.case) The maximum error code value that represents an iCloud error. [`NSUbiquitousFileNotUploadedDueToQuotaError`](/documentation/Foundation/NSUbiquitousFileNotUploadedDueToQuotaError-c.enum.case) The item could not be uploaded to iCloud because it would make the account go over its quota. [`NSUbiquitousFileUbiquityServerNotAvailable`](/documentation/Foundation/NSUbiquitousFileUbiquityServerNotAvailable-c.enum.case) A failure to connect to the iCloud servers. [`NSUbiquitousFileUnavailableError`](/documentation/Foundation/NSUbiquitousFileUnavailableError-c.enum.case) The item has not been uploaded to iCloud by another device yet. ### Property List Errors [`NSPropertyListErrorMinimum`](/documentation/Foundation/NSPropertyListErrorMinimum-c.enum.case) The start of the range of error codes reserved for property list errors. [`NSPropertyListErrorMaximum`](/documentation/Foundation/NSPropertyListErrorMaximum-c.enum.case) The end of the range of error codes reserved for property list errors. [`NSPropertyListReadCorruptError`](/documentation/Foundation/NSPropertyListReadCorruptError-c.enum.case) Parsing of the property list failed. [`NSPropertyListReadStreamError`](/documentation/Foundation/NSPropertyListReadStreamError-c.enum.case) Reading of the property list failed. [`NSPropertyListReadUnknownVersionError`](/documentation/Foundation/NSPropertyListReadUnknownVersionError-c.enum.case) The version number of the property list cannot be determined. [`NSPropertyListWriteInvalidError`](/documentation/Foundation/NSPropertyListWriteInvalidError-c.enum.case) Writing failed because of an invalid property list object, or an invalid property list type was specified. [`NSPropertyListWriteStreamError`](/documentation/Foundation/NSPropertyListWriteStreamError-c.enum.case) Writing to the property list failed. ### User Activity Errors [`NSUserActivityErrorMinimum`](/documentation/Foundation/NSUserActivityErrorMinimum-c.enum.case) The start of the range of error codes reserved for user activity errors. [`NSUserActivityErrorMaximum`](/documentation/Foundation/NSUserActivityErrorMaximum-c.enum.case) The end of the range of error codes reserved for user activity errors. [`NSUserActivityConnectionUnavailableError`](/documentation/Foundation/NSUserActivityConnectionUnavailableError-c.enum.case) The user activity couldn’t be continued because a required connection wasn’t available. [`NSUserActivityHandoffFailedError`](/documentation/Foundation/NSUserActivityHandoffFailedError-c.enum.case) The data for the user activity wasn’t available. [`NSUserActivityHandoffUserInfoTooLargeError`](/documentation/Foundation/NSUserActivityHandoffUserInfoTooLargeError-c.enum.case) The user info dictionary was too large to receive. [`NSUserActivityRemoteApplicationTimedOutError`](/documentation/Foundation/NSUserActivityRemoteApplicationTimedOutError-c.enum.case) The remote application failed to send data within the specified time. ### Validation Errors [`NSValidationErrorMinimum`](/documentation/Foundation/NSValidationErrorMinimum-c.enum.case) The start of the range of error codes reserved for validation errors. [`NSValidationErrorMaximum`](/documentation/Foundation/NSValidationErrorMaximum-c.enum.case) The end of the range of error codes reserved for validation errors. ### XPC Errors [`NSXPCConnectionErrorMinimum`](/documentation/Foundation/NSXPCConnectionErrorMinimum-c.enum.case) The lower bounds of XPC connection error code values. [`NSXPCConnectionErrorMaximum`](/documentation/Foundation/NSXPCConnectionErrorMaximum-c.enum.case) The upper bounds of XPC connection error code values. [`NSXPCConnectionInterrupted`](/documentation/Foundation/NSXPCConnectionInterrupted-c.enum.case) The XPC connection was interrupted. [`NSXPCConnectionInvalid`](/documentation/Foundation/NSXPCConnectionInvalid-c.enum.case) The XPC connection was invalid. [`NSXPCConnectionReplyInvalid`](/documentation/Foundation/NSXPCConnectionReplyInvalid-c.enum.case) The XPC connection reply was invalid. ### URL Errors [`NSURLErrorAppTransportSecurityRequiresSecureConnection`](/documentation/Foundation/NSURLErrorAppTransportSecurityRequiresSecureConnection-c.enum.case) App Transport Security disallowed a connection because there is no secure network connection. [`NSURLErrorBackgroundSessionInUseByAnotherProcess`](/documentation/Foundation/NSURLErrorBackgroundSessionInUseByAnotherProcess-c.enum.case) An app or app extension attempted to connect to a background session that is already connected to a process. [`NSURLErrorBackgroundSessionRequiresSharedContainer`](/documentation/Foundation/NSURLErrorBackgroundSessionRequiresSharedContainer-c.enum.case) The shared container identifier of the URL session configuration is needed but hasn’t been set. [`NSURLErrorBackgroundSessionWasDisconnected`](/documentation/Foundation/NSURLErrorBackgroundSessionWasDisconnected-c.enum.case) The app is suspended or exits while a background data task is processing. [`NSURLErrorBadServerResponse`](/documentation/Foundation/NSURLErrorBadServerResponse-c.enum.case) The URL Loading System received bad data from the server. [`NSURLErrorBadURL`](/documentation/Foundation/NSURLErrorBadURL-c.enum.case) A malformed URL prevented a URL request from being initiated. [`NSURLErrorCallIsActive`](/documentation/Foundation/NSURLErrorCallIsActive-c.enum.case) A connection was attempted while a phone call was active on a network that doesn’t support simultaneous phone and data communication, such as EDGE or GPRS. [`NSURLErrorCancelled`](/documentation/Foundation/NSURLErrorCancelled-c.enum.case) An asynchronous load has been canceled. [`NSURLErrorCannotCloseFile`](/documentation/Foundation/NSURLErrorCannotCloseFile-c.enum.case) A download task couldn’t close the downloaded file on disk. [`NSURLErrorCannotConnectToHost`](/documentation/Foundation/NSURLErrorCannotConnectToHost-c.enum.case) An attempt to connect to a host failed. [`NSURLErrorCannotCreateFile`](/documentation/Foundation/NSURLErrorCannotCreateFile-c.enum.case) A download task couldn’t create the downloaded file on disk because of an I/O failure. [`NSURLErrorCannotDecodeContentData`](/documentation/Foundation/NSURLErrorCannotDecodeContentData-c.enum.case) Content data received during a connection request had an unknown content encoding. [`NSURLErrorCannotDecodeRawData`](/documentation/Foundation/NSURLErrorCannotDecodeRawData-c.enum.case) Content data received during a connection request couldn’t be decoded for a known content encoding. [`NSURLErrorCannotFindHost`](/documentation/Foundation/NSURLErrorCannotFindHost-c.enum.case) The host name for a URL couldn’t be resolved. [`NSURLErrorCannotLoadFromNetwork`](/documentation/Foundation/NSURLErrorCannotLoadFromNetwork-c.enum.case) A specific request to load an item only from the cache couldn’t be satisfied. [`NSURLErrorCannotMoveFile`](/documentation/Foundation/NSURLErrorCannotMoveFile-c.enum.case) A downloaded file on disk couldn’t be moved. [`NSURLErrorCannotOpenFile`](/documentation/Foundation/NSURLErrorCannotOpenFile-c.enum.case) A downloaded file on disk couldn’t be opened. [`NSURLErrorCannotParseResponse`](/documentation/Foundation/NSURLErrorCannotParseResponse-c.enum.case) A response to a connection request couldn’t be parsed. [`NSURLErrorCannotRemoveFile`](/documentation/Foundation/NSURLErrorCannotRemoveFile-c.enum.case) A downloaded file couldn’t be removed from disk. [`NSURLErrorCannotWriteToFile`](/documentation/Foundation/NSURLErrorCannotWriteToFile-c.enum.case) A download task couldn’t write the file to disk. [`NSURLErrorClientCertificateRejected`](/documentation/Foundation/NSURLErrorClientCertificateRejected-c.enum.case) A server certificate was rejected. [`NSURLErrorClientCertificateRequired`](/documentation/Foundation/NSURLErrorClientCertificateRequired-c.enum.case) A client certificate was required to authenticate an SSL connection during a connection request. [`NSURLErrorDNSLookupFailed`](/documentation/Foundation/NSURLErrorDNSLookupFailed-c.enum.case) The host address couldn’t be found via DNS lookup. [`NSURLErrorDataLengthExceedsMaximum`](/documentation/Foundation/NSURLErrorDataLengthExceedsMaximum-c.enum.case) The length of the resource data exceeded the maximum allowed. [`NSURLErrorDataNotAllowed`](/documentation/Foundation/NSURLErrorDataNotAllowed-c.enum.case) The cellular network disallowed a connection. [`NSURLErrorDownloadDecodingFailedMidStream`](/documentation/Foundation/NSURLErrorDownloadDecodingFailedMidStream-c.enum.case) A download task failed to decode an encoded file during the download. [`NSURLErrorDownloadDecodingFailedToComplete`](/documentation/Foundation/NSURLErrorDownloadDecodingFailedToComplete-c.enum.case) A download task failed to decode an encoded file after downloading. [`NSURLErrorFileDoesNotExist`](/documentation/Foundation/NSURLErrorFileDoesNotExist-c.enum.case) The specified file doesn’t exist. [`NSURLErrorFileIsDirectory`](/documentation/Foundation/NSURLErrorFileIsDirectory-c.enum.case) A request for an FTP file resulted in the server responding that the file is not a plain file, but a directory. [`NSURLErrorFileOutsideSafeArea`](/documentation/Foundation/NSURLErrorFileOutsideSafeArea-c.enum.case) An internal file operation failed. [`NSURLErrorHTTPTooManyRedirects`](/documentation/Foundation/NSURLErrorHTTPTooManyRedirects-c.enum.case) A redirect loop was detected or the threshold for number of allowable redirects was exceeded (currently 16). [`NSURLErrorInternationalRoamingOff`](/documentation/Foundation/NSURLErrorInternationalRoamingOff-c.enum.case) The attempted connection required activating a data context while roaming, but international roaming is disabled. [`NSURLErrorNetworkConnectionLost`](/documentation/Foundation/NSURLErrorNetworkConnectionLost-c.enum.case) A client or server connection was severed in the middle of an in-progress load. [`NSURLErrorNoPermissionsToReadFile`](/documentation/Foundation/NSURLErrorNoPermissionsToReadFile-c.enum.case) A resource couldn’t be read because of insufficient permissions. [`NSURLErrorNotConnectedToInternet`](/documentation/Foundation/NSURLErrorNotConnectedToInternet-c.enum.case) A network resource was requested, but an internet connection has not been established and can’t be established automatically. [`NSURLErrorRedirectToNonExistentLocation`](/documentation/Foundation/NSURLErrorRedirectToNonExistentLocation-c.enum.case) A redirect was specified by way of server response code, but the server didn’t accompany this code with a redirect URL. [`NSURLErrorRequestBodyStreamExhausted`](/documentation/Foundation/NSURLErrorRequestBodyStreamExhausted-c.enum.case) A body stream was needed but the client did not provide one. [`NSURLErrorResourceUnavailable`](/documentation/Foundation/NSURLErrorResourceUnavailable-c.enum.case) A requested resource couldn’t be retrieved. [`NSURLErrorSecureConnectionFailed`](/documentation/Foundation/NSURLErrorSecureConnectionFailed-c.enum.case) An attempt to establish a secure connection failed for reasons that can’t be expressed more specifically. [`NSURLErrorServerCertificateHasBadDate`](/documentation/Foundation/NSURLErrorServerCertificateHasBadDate-c.enum.case) A server certificate is expired, or is not yet valid. [`NSURLErrorServerCertificateHasUnknownRoot`](/documentation/Foundation/NSURLErrorServerCertificateHasUnknownRoot-c.enum.case) A server certificate wasn’t signed by any root server. [`NSURLErrorServerCertificateNotYetValid`](/documentation/Foundation/NSURLErrorServerCertificateNotYetValid-c.enum.case) A server certificate isn’t valid yet. [`NSURLErrorServerCertificateUntrusted`](/documentation/Foundation/NSURLErrorServerCertificateUntrusted-c.enum.case) A server certificate was signed by a root server that isn’t trusted. [`NSURLErrorTimedOut`](/documentation/Foundation/NSURLErrorTimedOut-c.enum.case) An asynchronous operation timed out. [`NSURLErrorUnknown`](/documentation/Foundation/NSURLErrorUnknown-c.enum.case) The URL Loading System encountered an error that it can’t interpret. [`NSURLErrorUnsupportedURL`](/documentation/Foundation/NSURLErrorUnsupportedURL-c.enum.case) A properly formed URL couldn’t be handled by the framework. [`NSURLErrorUserAuthenticationRequired`](/documentation/Foundation/NSURLErrorUserAuthenticationRequired-c.enum.case) Authentication was required to access a resource. [`NSURLErrorUserCancelledAuthentication`](/documentation/Foundation/NSURLErrorUserCancelledAuthentication-c.enum.case) An asynchronous request for authentication has been canceled by the user. [`NSURLErrorZeroByteResource`](/documentation/Foundation/NSURLErrorZeroByteResource-c.enum.case) A server reported that a URL has a non-zero content length, but terminated the network connection gracefully without sending any data. ### Miscellaneous Errors [`NSFeatureUnsupportedError`](/documentation/Foundation/NSFeatureUnsupportedError-c.enum.case) The feature isn’t supported, because the file system lacks the feature, or required libraries are missing, or other similar reasons. [`NSKeyValueValidationError`](/documentation/Foundation/NSKeyValueValidationError-c.enum.case) A key-value coding validation error. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)