Fatal error: Uncaught Error: Class "FoF\OAuth\Provider" not found in /opt/lampp/htdocs/forum/flarum/vendor/fof/oauth/src/Providers/Twitter.php:17 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/fof/oauth/src/Providers/Twitter.php on line 17