Fatal error: Uncaught Error: Class "Doctrine\Persistence\Event\ManagerEventArgs" not found in C:\xampp\htdocs\retrodex\helpdesk\vendor\doctrine\orm\lib\Doctrine\ORM\Event\OnFlushEventArgs.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\retrodex\helpdesk\vendor\doctrine\orm\lib\Doctrine\ORM\Event\OnFlushEventArgs.php on line 18