---
title: Metadata Registry Error Codes
framework: coremedia
role: collectionGroup
role_heading: API Collection
path: coremedia/metadata-registry-errors
---

# Metadata Registry Error Codes

Error codes that indicate metadata registry errors.

## Topics

### Constants

- [kCMMetadataDataTypeRegistryError_AllocationFailed](coremedia/kcmmetadatadatatyperegistryerror_allocationfailed.md)
- [kCMMetadataDataTypeRegistryError_BadDataTypeIdentifier](coremedia/kcmmetadatadatatyperegistryerror_baddatatypeidentifier.md)
- [kCMMetadataDataTypeRegistryError_DataTypeAlreadyRegistered](coremedia/kcmmetadatadatatyperegistryerror_datatypealreadyregistered.md)
- [kCMMetadataDataTypeRegistryError_MultipleConformingBaseTypes](coremedia/kcmmetadatadatatyperegistryerror_multipleconformingbasetypes.md)
- [kCMMetadataDataTypeRegistryError_RequiredParameterMissing](coremedia/kcmmetadatadatatyperegistryerror_requiredparametermissing.md)
- [kCMMetadataDataTypeRegistryError_RequiresConformingBaseType](coremedia/kcmmetadatadatatyperegistryerror_requiresconformingbasetype.md)

## See Also

### Constants

- [Metadata Identifier Error Codes](coremedia/metadata-identifier-errors.md)
- [Metadata Identifier Keyspaces](coremedia/metadata-identifier-keyspaces.md)
- [Metadata Identifiers](coremedia/metadata-identifiers.md)
- [Metadata Base Data Types](coremedia/metadata-base-data-types.md)
- [Metadata Data Types](coremedia/metadata-data-types.md)