---
title: kAudioSessionIncompatibleCategory
framework: audiotoolbox
role: symbol
role_heading: Global Variable
path: audiotoolbox/kaudiosessionincompatiblecategory
---

# kAudioSessionIncompatibleCategory

The specified audio session category cannot be used for the attempted audio operation. For example, you attempted to play or record audio with the audio session category set to kAudioSessionCategory_AudioProcessing.

## Declaration

```swift
var kAudioSessionIncompatibleCategory: Int { get }
```

## See Also

### Constants

- [kAudioSessionNoError](audiotoolbox/kaudiosessionnoerror.md)
- [kAudioSessionNotInitialized](audiotoolbox/kaudiosessionnotinitialized.md)
- [kAudioSessionAlreadyInitialized](audiotoolbox/kaudiosessionalreadyinitialized.md)
- [kAudioSessionInitializationError](audiotoolbox/kaudiosessioninitializationerror.md)
- [kAudioSessionUnsupportedPropertyError](audiotoolbox/kaudiosessionunsupportedpropertyerror.md)
- [kAudioSessionBadPropertySizeError](audiotoolbox/kaudiosessionbadpropertysizeerror.md)
- [kAudioSessionNotActiveError](audiotoolbox/kaudiosessionnotactiveerror.md)
- [kAudioServicesNoHardwareError](audiotoolbox/kaudioservicesnohardwareerror.md)
- [kAudioSessionNoCategorySet](audiotoolbox/kaudiosessionnocategoryset.md)
- [kAudioSessionUnspecifiedError](audiotoolbox/kaudiosessionunspecifiederror.md)