Fatal error: Uncaught Error: Class "Symfony\Component\Form\FormEvent" not found in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\form\Event\PostSetDataEvent.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\retrodex\helpdesk\vendor\symfony\form\Event\PostSetDataEvent.php on line 21