Fatal error: Uncaught Error: Class "League\OAuth2\Server\Grant\AbstractGrant" not found in /home/vincent/http/concrete5/concrete/vendor/league/oauth2-server/src/Grant/ClientCredentialsGrant.php:20 Stack trace: #0 {main} thrown in /home/vincent/http/concrete5/concrete/vendor/league/oauth2-server/src/Grant/ClientCredentialsGrant.php on line 20