Fatal error: Uncaught Error: Class "Flarum\Foundation\AbstractServiceProvider" not found in /opt/lampp/htdocs/forum/flarum/vendor/fof/oauth/src/OAuthServiceProvider.php:20 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/fof/oauth/src/OAuthServiceProvider.php on line 20