Rails - Sep 2012 - ActionController::DoubleRenderError in Controls/itemsController#update Can only render or redirect

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?

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