Fatal error: Uncaught Error: Class 'League\OAuth2\Server\Grant\AbstractGrant' not found in C:\xampp\htdocs\reservation\vendor\league\oauth2-server\src\Grant\ClientCredentialsGrant.php:24 Stack trace: #0 {main} thrown in C:\xampp\htdocs\reservation\vendor\league\oauth2-server\src\Grant\ClientCredentialsGrant.php on line 24