Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in /home/www/drupal8/test/core/modules/dynamic_page_cache/src/EventSubscriber/DynamicPageCacheSubscriber.php:35 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/dynamic_page_cache/src/EventSubscriber/DynamicPageCacheSubscriber.php on line 35