Fatal error: Uncaught Error: Interface 'Symfony\Component\EventDispatcher\EventDispatcherInterface' not found in /opt/lampp/htdocs/vendor/symfony/event-dispatcher/ImmutableEventDispatcher.php:19 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/vendor/symfony/event-dispatcher/ImmutableEventDispatcher.php on line 19