Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in /users/danielstruebig/www/familyhelper/vendor/symfony/mailer/EventListener/DkimSignedMessageListener.php:24 Stack trace: #0 {main} thrown in /users/danielstruebig/www/familyhelper/vendor/symfony/mailer/EventListener/DkimSignedMessageListener.php on line 24