Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in /home/www/drupal8/test/core/modules/rest/src/EventSubscriber/ResourceResponseSubscriber.php:23 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/rest/src/EventSubscriber/ResourceResponseSubscriber.php on line 23