Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in /srv/www/sites/public/starter-projects/vendor/symfony/mailer/EventListener/EnvelopeListener.php:24 Stack trace: #0 {main} thrown in /srv/www/sites/public/starter-projects/vendor/symfony/mailer/EventListener/EnvelopeListener.php on line 24