Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventDispatcherInterface" not found in /var/www/apache/dev/cal/web/vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcherInterface.php:19 Stack trace: #0 {main} thrown in /var/www/apache/dev/cal/web/vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcherInterface.php on line 19