Fatal error: Uncaught Error: Class 'League\OAuth2\Server\Grant\AbstractGrant' not found in C:\xampp\htdocs\reservation\vendor\league\oauth2-server\src\Grant\RefreshTokenGrant.php:27 Stack trace: #0 {main} thrown in C:\xampp\htdocs\reservation\vendor\league\oauth2-server\src\Grant\RefreshTokenGrant.php on line 27