Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventDispatcherInterface" not found in /users/ms-it/www/oc/lib/composer/symfony/event-dispatcher/ImmutableEventDispatcher.php:19 Stack trace: #0 {main} thrown in /users/ms-it/www/oc/lib/composer/symfony/event-dispatcher/ImmutableEventDispatcher.php on line 19