Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in /srv/www/sites/public/starter-cms/vendor/symfony/mailer/EventListener/MessageListener.php:28 Stack trace: #0 {main} thrown in /srv/www/sites/public/starter-cms/vendor/symfony/mailer/EventListener/MessageListener.php on line 28