Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in /home/www/drupal8/test/core/modules/block_place/src/EventSubscriber/BlockPlaceEventSubscriber.php:14
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/modules/block_place/src/EventSubscriber/BlockPlaceEventSubscriber.php on line 14