Fatal error: Uncaught Error: Interface "Symfony\Contracts\EventDispatcher\EventDispatcherInterface" not found in /users/ms-it/www/oc/lib/composer/symfony/event-dispatcher/EventDispatcherInterface.php:23 Stack trace: #0 {main} thrown in /users/ms-it/www/oc/lib/composer/symfony/event-dispatcher/EventDispatcherInterface.php on line 23