Fatal error: Uncaught Error: Interface 'Symfony\Component\EventDispatcher\EventSubscriberInterface' not found in /home/eberhardschwarze/public_html/vendor/symfony/swiftmailer-bundle/EventListener/EmailSenderListener.php:27 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/symfony/swiftmailer-bundle/EventListener/EmailSenderListener.php on line 27