PHP Symfony parameter to expected to be a reference, value given in bootstrap.php.cache

Question

I am passing one optional parameter to route.

Till yesterday this was working, all of sudden getting this error

Controller code

/**
     * @Route("/usersFbVideo",name="_create_fb_social_gration")
     * @Template()
     */
    public function usersFbVideoAction(Request $request, $call_from=null,&$user_visiting_card_path=null)
    {  
     ......
    }

function submit code from .html.twig file

<form id="create_my_video" method="post" action="{{ path('_create_fb_social_gration')}}">                   </form> 
        <div class="popupBg"></div>
        <div class="popupBox small">
          <div class="popup-content">
             Please wait, we are processing your request
          </div>
       </div>

{% endblock %}

{% block javascripts %}
<script>
    $(document).ready(function(){
        $("form").submit();
    });
</script>
{% endblock %}