| Name | Type | Description | Notes |
|---|---|---|---|
| key | String | The model config key that was not added | |
| message | String | Why the key was not added. A key that a config variation uses cannot be restricted. Move those variations to a different model first. | |
| code | Integer | HTTP status code for this key. `400` means a config variation uses the key. `404` means the key does not exist in the project. |