Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /users/danielstruebig/www/familyhelper/vendor/symfony/mailer/Event/SentMessageEvent.php:20 Stack trace: #0 {main} thrown in /users/danielstruebig/www/familyhelper/vendor/symfony/mailer/Event/SentMessageEvent.php on line 20