---
title: AccessoryControlDevice.Error.unknown
framework: AudioAccessoryKit
role: symbol
role_heading: Case
platforms: [iOS 26.4+]
path: audioaccessorykit/accessorycontroldevice/error/unknown
---

# AccessoryControlDevice.Error.unknown

An error indicating an unknown error.

## Declaration

```swift
case unknown
```

## See Also

### Error cases

- [AccessoryControlDevice.Error.accessoryNotCapable](audioaccessorykit/accessorycontroldevice/error/accessorynotcapable.md)
- [AccessoryControlDevice.Error.invalidRequest](audioaccessorykit/accessorycontroldevice/error/invalidrequest.md)
- [AccessoryControlDevice.Error.invalidated](audioaccessorykit/accessorycontroldevice/error/invalidated.md)