> ## Documentation Index
> Fetch the complete documentation index at: https://smartcar.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# Configuration
> This error occurs when the user has encountered an Error page in Connect and has chosen to return to your application.
| Parameter | Required | Description |
| ------------------- | -------- | ----------------------------------------------------------------- |
| `error` | `true` | `configuration_error` |
| `error_description` | `true` | There has been an error in the configuration of your application. |
| `status_code` | `true` | The status code of the error encountered in Connect |
| `error_message` | `true` | The error message seen by the user |
```http Example redirect uri theme={null}
HTTP/1.1 302 Found
Location: https://example.com/callback
?error=configuration_error
&error_description=There%20has%20been%20an%20error%20in%20the%20configuration%20of%20your%20application.&status_code=400
&error_message=You%20have%20entered%20a%20test%20mode%20VIN.%20Please%20enter%20a%20VIN%20that%20belongs%20to%20a%20real%20vehicle.
```
On redirect, Connect will return the status code and message of the error that they encountered. This will be triggered if:
* A user tried to directly navigate to a page that is past their current step in Connect (i.e. going directly from the Preamble screen to the Permission Grants screen by directly going to connect.smartcar.com/grant).
* A user is trying to use Single Select in live mode with a test mode VIN or with a simulated VIN in a non-simulated mode.
* A user is trying to use Single Select with an invalid mock VIN.
* A validation error occurs when trying to check compatibility by VIN.
These cases will trigger the following error and give the user the ability to “Exit” Connect.
