# Error Codes AssetsLibrary-related error codes ## Topics ### Constants [`var ALAssetsLibraryUnknownError: Int`](/documentation/AssetsLibrary/ALAssetsLibraryUnknownError) The reason for the error is unknown. [`var ALAssetsLibraryWriteFailedError: Int`](/documentation/AssetsLibrary/ALAssetsLibraryWriteFailedError) The attempt to write data failed. [`var ALAssetsLibraryWriteBusyError: Int`](/documentation/AssetsLibrary/ALAssetsLibraryWriteBusyError) Writing was already busy when the attempt to write was made. [`var ALAssetsLibraryWriteInvalidDataError: Int`](/documentation/AssetsLibrary/ALAssetsLibraryWriteInvalidDataError) The data was invalid. [`var ALAssetsLibraryWriteIncompatibleDataError: Int`](/documentation/AssetsLibrary/ALAssetsLibraryWriteIncompatibleDataError) The data contained incompatible data. [`var ALAssetsLibraryWriteDataEncodingError: Int`](/documentation/AssetsLibrary/ALAssetsLibraryWriteDataEncodingError) The data contained data with the wrong encoding. [`var ALAssetsLibraryWriteDiskSpaceError: Int`](/documentation/AssetsLibrary/ALAssetsLibraryWriteDiskSpaceError) There was not enough space on the disk to write the data. [`var ALAssetsLibraryDataUnavailableError: Int`](/documentation/AssetsLibrary/ALAssetsLibraryDataUnavailableError) The data was not available. [`var ALAssetsLibraryAccessUserDeniedError: Int`](/documentation/AssetsLibrary/ALAssetsLibraryAccessUserDeniedError) The user denied access to the library. [`var ALAssetsLibraryAccessGloballyDeniedError: Int`](/documentation/AssetsLibrary/ALAssetsLibraryAccessGloballyDeniedError) Access to the library was denied globally. --- 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)