Fatal error: Uncaught Error: Interface "Symfony\Component\Form\RequestHandlerInterface" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\form\Extension\HttpFoundation\HttpFoundationRequestHandler.php:29 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\form\Extension\HttpFoundation\HttpFoundationRequestHandler.php on line 29