Fatal error: Uncaught Error: Class 'Doctrine\Common\EventArgs' not found in C:\xampp\htdocs\portal\vendor\doctrine\common\lib\Doctrine\Common\Persistence\Event\LifecycleEventArgs.php:34 Stack trace: #0 {main} thrown in C:\xampp\htdocs\portal\vendor\doctrine\common\lib\Doctrine\Common\Persistence\Event\LifecycleEventArgs.php on line 34