Fatal error: Uncaught Error: Class 'Symfony\Component\Security\Core\Event\AuthenticationEvent' not found in C:\xampp\htdocs\plugins\Symfony\Component\Security\Core\Event\AuthenticationSuccessEvent.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\plugins\Symfony\Component\Security\Core\Event\AuthenticationSuccessEvent.php on line 14