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

# AccessoryControlDevice.Error

An error that occurs during audio accessory configuration operations.

## Declaration

```swift
enum Error
```

## Overview

Overview Use error cases to identify the cause of failures when registering devices or updating their state.

## Topics

### 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)
- [AccessoryControlDevice.Error.unknown](audioaccessorykit/accessorycontroldevice/error/unknown.md)

## Relationships

### Conforms To

- [Equatable](swift/equatable.md)
- [Error](swift/error.md)
- [Hashable](swift/hashable.md)
- [LocalizedError](foundation/localizederror.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)