Fatal error: Uncaught Error: Interface "Symfony\Contracts\EventDispatcher\EventDispatcherInterface" not found in /home/vulcans/new-v2/vendor/symfony/event-dispatcher/EventDispatcherInterface.php:23 Stack trace: #0 {main} thrown in /home/vulcans/new-v2/vendor/symfony/event-dispatcher/EventDispatcherInterface.php on line 23