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# CMSync error codes

Constants that represent error codes Core Media sync operations return.

## Topics

### Constants

[`var kCMSyncError_MissingRequiredParameter: OSStatus`](/documentation/CoreMedia/kCMSyncError_MissingRequiredParameter)

A sync error that indicates a parameter is missing.

[`var kCMSyncError_InvalidParameter: OSStatus`](/documentation/CoreMedia/kCMSyncError_InvalidParameter)

A sync error that indicates a parameter isn’t valid.

[`var kCMSyncError_AllocationFailed: OSStatus`](/documentation/CoreMedia/kCMSyncError_AllocationFailed)

A sync error that indicates the memory allocation fails.

[`var kCMSyncError_RateMustBeNonZero: OSStatus`](/documentation/CoreMedia/kCMSyncError_RateMustBeNonZero)

A sync error that indicates the rate is nonzero.


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