I need to use ezsurvey extension in a 5.3 project using the symfony stack.

Unfortunately, I get an exception when submitting the form :
"An exception has been thrown during the rendering of a template ("Error when rendering "XXXX" (Status code is 302).") ..."

Here are the steps I followed to render the ezsurvey legacy template in my twig template :

• I installed ezsurvey in ezpulish_legacy and created a new survey
• I created an empty layout ('none') in my project's legacy extension (contains only {$module_result.content})
• I created an overrride full view twig template for my ezsurvey class in symfony. This template contains the following code :

{{ render( url( 'ez_legacy',

{'module_uri': '/layout/set/none/content/view/full/'~location.id}

) ) }}

The ezsurvey form loads fine and I can submit the form (ezsurvey catches errors and displays them in the legacy template with success).

But I am unable to submit the form as I get the error mentioned above.
I guess this may have something to do with the $Module->redirectTo( $survey->attribute( 'redirect_submit' ) ); statement in ezsurvey, which doesn't redirect to the correct symfony route, but I don't know how to fix this.

Thanks for your help.