Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventDispatcherInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/symfony/event-dispatcher/EventDispatcher.php:32 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/symfony/event-dispatcher/EventDispatcher.php on line 32