Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /var/www/html/immobilier-des-particuliers.fr/vendor/symfony/form/FormEvent.php:19 Stack trace: #0 {main} thrown in /var/www/html/immobilier-des-particuliers.fr/vendor/symfony/form/FormEvent.php on line 19