Fatal error: Uncaught Error: Interface "Symfony\Component\Form\FormExtensionInterface" not found in /home/pataplou/www/patrick/pataplouf/vendor/symfony/form/Extension/DependencyInjection/DependencyInjectionExtension.php:21 Stack trace: #0 {main} thrown in /home/pataplou/www/patrick/pataplouf/vendor/symfony/form/Extension/DependencyInjection/DependencyInjectionExtension.php on line 21