Fatal error: Uncaught Error: Interface 'Symfony\Component\EventDispatcher\EventSubscriberInterface' not found in /var/www/html/tmp/contrib/flag/tests/modules/flag_event_test/src/EventSubscriber/FlagEvents.php:15 Stack trace: #0 {main} thrown in /var/www/html/tmp/contrib/flag/tests/modules/flag_event_test/src/EventSubscriber/FlagEvents.php on line 15