Symfony modal form redirection – Symfony Questions

I would like to register an entity with a modal form. In the template, I add the modal container in which I call a controller function :

    <div id="periodFormModal" tabindex="-1" class="modal fade" role="dialog">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <h4 class="modal-title">{{ 'periods.updating.text'|trans }}</h4>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        {{ render(controller('AppControlleradvertAdvertPeriodController::new', {'request': app.request, 'id': advert.id})) }}
      </div>
    </div>
  </div>
</div>

In the controller function, after the registering, to update the template with new created informations, I make a redirection to this template :

        if ($form->isSubmitted() && $form->isValid()) 
    {            

        //
        
        $manager->persist($period);
        $manager->flush();

        $element = $this->translator->trans('period.flash') . ' ';
        $message = $this->translator->trans('success.creation.flash', ['element' => $element, 'gender' => 'feminine', 'number' => 1]);
        $this->addFlash('success', $message);

        return $this->redirectToRoute('advert.periods.fullcalendar', array('id' => $advert->getId()));
    }

When redirection, the entity is correctly registered but I have this error :

An exception has been thrown during the rendering of a template ("Error when rendering "https://127.0.0.1:8000/en/advert/periods/fullcalendar/1" (Status code is 302).").

Source: Symfony Questions

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