Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in /usr/local/www/dctalk/data/forum/ext/gfksx/thanksforposts/event/listener.php:20 Stack trace: #0 {main} thrown in /usr/local/www/dctalk/data/forum/ext/gfksx/thanksforposts/event/listener.php on line 20