ActionController::DoubleRenderError in Controls/itemsController#update Can only render or redirect

[sumanta]

      responds_to_parent do

          render :update do |page|

              page << "tb_remove"

              item_link = params[:controller].eql?("compliance_items") ? edit_compliance_compliance_item_path(master, @master_item) : edit_controls_item_path(@master_item)

              #          page.redirect_to(item_link + "?token=#{params[:token]}")

         end

     end

Hi in the above code I am gettign double render error(subject line is the error )... can anybody please help?