Fatal error: Uncaught Error: Class "Symfony\Component\Form\AbstractType" not found in /home/zdpktgd/ptc/src/Form/FormType/Planning/ModifierPlanningFormType.php:21 Stack trace: #0 {main} thrown in /home/zdpktgd/ptc/src/Form/FormType/Planning/ModifierPlanningFormType.php on line 21