Fatal error: Uncaught Error: Class "Symfony\Component\Form\FormEvent" not found in /var/www/html/immobilier-des-particuliers.fr/vendor/symfony/form/Event/PostSubmitEvent.php:23 Stack trace: #0 {main} thrown in /var/www/html/immobilier-des-particuliers.fr/vendor/symfony/form/Event/PostSubmitEvent.php on line 23