Argument 1 passed to Symfony\Component\Form\FormRenderer::renderBlock() must be an instance of ...\FormView, instance of ...\Form given
/** * @Route("/register", name="registrationPage") */public function showRegistrationPage(Request $request){ $form = $this->createForm(RegisterType::class, (new UserInformation())); return $this->render('auth/register.html.twig', [ 'register_form' => $form->createView() ]);}
the missing part was createView() method
/** * @Route("/register", name="registrationPage") */public function showRegistrationPage(Request $request){ return $this->render('auth/register.html.twig', [ 'register_form' => $this->createForm(RegisterType::class, (new UserInformation()))->createView() ]);}