Fatal error: Uncaught Error: Class "Symfony\Component\Form\AbstractType" not found in /home/marcgron/www/SSA/v2/vendor/symfony/form/Flow/Type/ButtonFlowType.php:26 Stack trace: #0 {main} thrown in /home/marcgron/www/SSA/v2/vendor/symfony/form/Flow/Type/ButtonFlowType.php on line 26