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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

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

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

[`AVAudioEngineManualRenderingErrorInvalidMode`](/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.

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

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

## Relationships

### Conforms To

[`RawRepresentable`](/documentation/Swift/RawRepresentable)

[`BitwiseCopyable`](/documentation/Swift/BitwiseCopyable)

[`Equatable`](/documentation/Swift/Equatable)

[`Sendable`](/documentation/Swift/Sendable)

[`Hashable`](/documentation/Swift/Hashable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

---

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