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# DCError.Code

DeviceCheck error codes.

```
enum Code
```

## Topics

### Error codes

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

DeviceCheck is unavailable on this device.

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

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

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

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

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

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

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

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


---

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