Symfony: How to check the data sent by form

When I submitted the form with the smyfony4 app, I got the following error.
Since it is an error of the entire form, it is not possible to identify the cause.
I want to debug the value of the submitted form.
What should I do?

I'm sorry for the question like a beginner.

Error

shop => Not a valid value.  

                                          <div class='formGroup'>                                                                    </div>      .      .      .        

        $form = $this->createForm(ShopType::class, $shop, array(              "method" => "PUT",              "action" => $this->generateUrl("app_shop_shop_update"),              "em" => $this->getDoctrine()->getManager(),          ));            if ($request->isMethod('PUT')) {              if ($form->handleRequest($request)->isValid()) {                  // save                  $this->get("admin.shopService")->save($shop);                  $this->get('session')->getFlashBag()->add('success', 'I saved my shop profile.');                  return $this->redirect($this->generateUrl('ahi_sp_admin_shop_shop_edit'));              } else {                  $this->get('session')->getFlashBag()->add('error', 'The shop profile could not be saved. Please check the input contents.');              }          }  

https://stackoverflow.com/questions/66886113/symfony-how-to-check-the-data-sent-by-form March 31, 2021 at 06:34PM