Fatal error: Uncaught Error: Class 'Symfony\Component\Form\FormEvent' not found in C:\xampp\htdocs\ApiSigestWin\vendor\symfony\form\Event\PostSetDataEvent.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ApiSigestWin\vendor\symfony\form\Event\PostSetDataEvent.php on line 21