Fatal error: Uncaught Error: Class 'Symfony\Component\Form\FormEvent' not found in C:\xampp\htdocs\ApiSigestWin\1.0\vendor\symfony\form\Event\PostSubmitEvent.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ApiSigestWin\1.0\vendor\symfony\form\Event\PostSubmitEvent.php on line 22