Fatal error: Uncaught Error: Class "League\OAuth2\Server\Exception\OAuthServerException" not found in I:\www\oauth2\auth_server\vendor\league\oauth2-server\src\Exception\UniqueTokenIdentifierConstraintViolationException.php:12 Stack trace: #0 {main} thrown in I:\www\oauth2\auth_server\vendor\league\oauth2-server\src\Exception\UniqueTokenIdentifierConstraintViolationException.php on line 12