Fatal error: Uncaught Error: Class 'League\OAuth2\Server\ResponseTypes\AbstractResponseType' not found in C:\xampp\htdocs\reservation\vendor\league\oauth2-server\src\ResponseTypes\BearerTokenResponse.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\reservation\vendor\league\oauth2-server\src\ResponseTypes\BearerTokenResponse.php on line 19