# Error Constants Error code constants for framework operations. ## Topics ### Constants [`matchAttemptFailed`](/documentation/ShazamKit/SHError/matchAttemptFailed) The error code to indicate when a Shazam Music catalog server issue prevents finding a match. [`signatureInvalid`](/documentation/ShazamKit/SHError/signatureInvalid) The error code to indicate that the system is unable to generate a signature from the audio. [`signatureDurationInvalid`](/documentation/ShazamKit/SHError/signatureDurationInvalid) The error code to indicate that the length of the generated signature is too long or too short to make a match in the catalog. [`invalidAudioFormat`](/documentation/ShazamKit/SHError/invalidAudioFormat) The error code to indicate an unsupported audio format. [`internalError`](/documentation/ShazamKit/SHError/internalError) The error code to indicate a generic framework error. [`audioDiscontinuity`](/documentation/ShazamKit/SHError/audioDiscontinuity) The error code to indicate the use of noncontiguous audio to request a match. [`customCatalogInvalidURL`](/documentation/ShazamKit/SHError/customCatalogInvalidURL) The error code to indicate that the format for the custom catalog URL is invalid. [`customCatalogInvalid`](/documentation/ShazamKit/SHError/customCatalogInvalid) The error code to indicate when the custom catalog fails to load due to an invalid format. [`mediaItemFetchFailed`](/documentation/ShazamKit/SHError/mediaItemFetchFailed) The error code to indicate when the system fails to fetch one or more media items. [`mediaLibrarySyncFailed`](/documentation/ShazamKit/SHError/mediaLibrarySyncFailed) The error code that indicates when the system fails to add media items to or remove items from the user’s Shazam library. --- 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)