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# AVAudioEngineManualRenderingError

Constants that describe error codes that the framework returns from manual rendering mode methods.

```
enum AVAudioEngineManualRenderingError
```

## Topics

### Manual Rendering Errors

[`AVAudioEngineManualRenderingError.initialized`](/documentation/AVFAudio/AVAudioEngineManualRenderingError/initialized)

An operation that the system can’t perform because the engine is still running.

[`AVAudioEngineManualRenderingError.invalidMode`](/documentation/AVFAudio/AVAudioEngineManualRenderingError/invalidMode)

An operation the system can’t perform because the engine isn’t in manual rendering mode or the right variant of it.

[`AVAudioEngineManualRenderingError.notRunning`](/documentation/AVFAudio/AVAudioEngineManualRenderingError/notRunning)

An operation the system can’t perform because the engine isn’t running.


---

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