Fatal error: Uncaught Error: Class "League\OAuth2\Server\Grant\AbstractGrant" not found in I:\www\oauth2\auth_server\vendor\league\oauth2-server\src\Grant\ClientCredentialsGrant.php:24 Stack trace: #0 {main} thrown in I:\www\oauth2\auth_server\vendor\league\oauth2-server\src\Grant\ClientCredentialsGrant.php on line 24