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# DCError

A type that indicates when DeviceCheck encounters an error.

```
struct DCError
```

## Topics

### Errors

[`featureUnsupported`](/documentation/DeviceCheck/DCError-swift.struct/featureUnsupported)

DeviceCheck is not available on this device.

[`invalidInput`](/documentation/DeviceCheck/DCError-swift.struct/invalidInput)

An error code that indicates when your app provides data that isn’t formatted correctly.

[`invalidKey`](/documentation/DeviceCheck/DCError-swift.struct/invalidKey)

An error caused by a failed attempt to use the App Attest key.

[`serverUnavailable`](/documentation/DeviceCheck/DCError-swift.struct/serverUnavailable)

An error that indicates a failed attempt to contact the App Attest service during an attestation.

[`unknownSystemFailure`](/documentation/DeviceCheck/DCError-swift.struct/unknownSystemFailure)

A failure has occurred, such as the failure to generate a token.

[`DCError.Code`](/documentation/DeviceCheck/DCError-swift.struct/Code)

DeviceCheck error codes.

### Error information

[`errorDomain`](/documentation/DeviceCheck/DCError-swift.struct/errorDomain)

The error domain for errors associated with DeviceCheck APIs.


---

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