Fatal error: Uncaught Error: Class "Symfony\Component\EventDispatcher\GenericEvent" not found in /srv/disk3/2724534/www/transdoetaskforce.org/concrete/src/Conversation/Message/MessageEvent.php:4 Stack trace: #0 {main} thrown in /srv/disk3/2724534/www/transdoetaskforce.org/concrete/src/Conversation/Message/MessageEvent.php on line 4