Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\notifier\Event\SentMessageEvent.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\notifier\Event\SentMessageEvent.php on line 20