> ## Documentation Index
> Fetch the complete documentation index at: https://docs.crossmint.com/llms.txt
> Use this file to discover all available pages before exploring further.

# CrossmintAuthException

> Flutter Final Class

**Final Class**

Thrown by authentication flows — OTP failures, OAuth callback errors, session restore issues, JWT expiry, logout failures.

```dart theme={null}
final class CrossmintAuthException extends CrossmintException
```

## Constructors

### CrossmintAuthException

```dart theme={null}
const CrossmintAuthException(
  super.message, {
  super.code = CrossmintErrorCode.unknown,
  super.cause,
})
```

Creates an auth exception.