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# kCMBufferQueueError_InvalidCMBufferCallbacksStruct

The format of a callbacks structure isn’t correct.

```
var kCMBufferQueueError_InvalidCMBufferCallbacksStruct: OSStatus { get }
```

## Discussion

Indicates that the [`version`](/documentation/CoreMedia/CMBufferCallbacks/version) isn’t `0`, or getDuration is NULL.

---

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