Fatal error: Uncaught Error: Class "FoF\Extend\Controllers\AbstractOAuthController" not found in /opt/lampp/htdocs/forum/flarum/vendor/fof/oauth/src/Controller.php:28 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/fof/oauth/src/Controller.php on line 28