title: Error while exporting GridPanel (EXT) to Excel
body: <p>given the function to export the Gridpanel</p>
  
  <pre><code>    Dim json As String = e.ExtraParams("GridRows")
      Dim eSubmit As New StoreSubmitDataEventArgs(json, Nothing)
      Dim xml As XmlNode = eSubmit.Xml
  
      Me.Response.Clear()
      Me.Response.ContentType = "application/vnd.ms-excel"
      Me.Response.AddHeader("Content-Disposition", "attachment; filename=submittedData.xlsx")
  
      Dim xtExcel As New XslCompiledTransform()
  
      xtExcel.Load(Server.MapPath("Excel.xslt"))
      xtExcel.Transform(xml, Nothing, Me.Response.OutputStream)
      Me.Response.[End]()
  </code></pre>
  
  <p>the export isn't working , but i can see all the content in a window error while executing the project , status code 200 the message is "BADRESPONSE: Cannot read property 'documentElement' of null" why is this happening ?</p>