Getting An Error While Trying To Read A Web Service?

I have a simple little web page that is trying to read a "Sharepoint Search Service" Web Service. When I try to execute the highlighted line of code, I get the following error:

Code:

Data at the root level is invalid. Line 1, position 1.

Here is my code:

Code:

Protected Sub btnParse_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnParse.Click
Try
Dim xmlTemplate As String = ""
xmlTemplate += "Your search cannot be completed because of a service error"
Dim ds As New DataSet
queryService.Url = "http://cscacmxxd001/_vti_bin/spsearch.asmx"
queryService.Credentials = New System.Net.NetworkCredential("MyUserID", "MyPassword", "cs")
ds = queryService.QueryEx(xmlTemplate)
If ds.Tables(0) IsNot DBNull.Value Then
For Each row As DataRow In ds.Tables(0).Rows
MsgBox("Made it here!")
txtParsedData.Text &= row.Item(0) & vbCrLf
Next
Else
lblMessage.Text = "There is no data!"
End If
Catch ex As Exception
lblMessage.Text = ex.Message
End Try
End Sub