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# unitRenderAction_PostRenderError

If this flag is set on the post-render call an error was returned by the audio unit’s render operation. In this case, the error can be retrieved through the lastRenderError property and the audio data in `ioData` handed to the post-render notification will be invalid.

```
static var unitRenderAction_PostRenderError: AudioUnitRenderActionFlags { get }
```

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