Fatal error: Uncaught Error: Class "Symfony\Component\EventDispatcher\Event" not found in C:\xampp\htdocs\BK\bateriasec\vendor\friendsofsymfony\user-bundle\Event\FormEvent.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\BK\bateriasec\vendor\friendsofsymfony\user-bundle\Event\FormEvent.php on line 22