Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /var/www/html/extensions/k3crmExt/backend/Events/StartFetchingFromChannel.php:7 Stack trace: #0 {main} thrown in /var/www/html/extensions/k3crmExt/backend/Events/StartFetchingFromChannel.php on line 7