Extender controls must be registered using RegisterExtenderControl() before calling RegisterScriptDescriptors()

Hi all,

  I am binding gridview using the below code

if (ipColl != null && ipColl.Count > 0)
        {
            gvServices.DataSource = ipColl;
            gvServices.DataBind();
        }
            StringWriter Sw = new StringWriter();
            HtmlTextWriter Htw = new HtmlTextWriter(Sw);
            gvServices.RenderControl(Htw);
            Sw.Close();
            Htw.Close();

 within the gridview we have autocomplete extender, i am getting the below error

    Extender control 'autoComplete1' is not a registered extender control. Extender controls

must be registered using RegisterExtenderControl() before calling RegisterScriptDescriptors().
Parameter name: extenderControl. 

 please help,

Thanks & Reagards,

Srinivasu.D