Fatal error: Uncaught Error: Class "Symfony\Component\Form\AbstractExtension" not found in /home/projetwewv/www/licence00/monapp/vendor/symfony/form/Extension/Validator/ValidatorExtension.php:28 Stack trace: #0 {main} thrown in /home/projetwewv/www/licence00/monapp/vendor/symfony/form/Extension/Validator/ValidatorExtension.php on line 28