Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in /home/bimmertest/BookStack/vendor/ssddanbrown/symfony-mailer/EventListener/MessageListener.php:28 Stack trace: #0 {main} thrown in /home/bimmertest/BookStack/vendor/ssddanbrown/symfony-mailer/EventListener/MessageListener.php on line 28