Read XML Document From VB .net Ap

I'm getting an error trying to read an xml file.  Can someone pin-point me in the right direction.  Thanks

This is the error I'm getting:
Note: Server Type Must Be Client To Perform This.
Error Reading Client_Default_Server.xml
Data at the root level is invalid. Line 1, position 1.
System.Xml

This is my code:
Private Function Read_Default_Client() As String
        Try
            Read_Default_Client = ""
            Dim doc As New XmlDocument
            doc.LoadXml("~/App_Data/Client_Default_Server.xml")
            Dim node As XmlNode = doc.DocumentElement.SelectSingleNode("/root1")

            For Each child As XmlNode In node.ChildNodes
                Dim sDomain As String = child.Attributes("Domain").Value
                Dim sName As String = child.Attributes("Name").Value
                If sDomain = Common_Functions.GetUserDomainName Then
                    Read_Default_Client = sName
                    Exit For
                End If
            Next

            Exit Function

        Catch Err As Exception
            Read_Default_Client = ""
            Response.Write("<font color=red>Error Reading Client_Default_Server.xml<BR></font>")
            Error_Handling.Regular_Exception(Err)
        End Try
    End Function


This is my xml file:
<?xml version="1.0" encoding="utf-8" ?>
<root1>
      <element1 name="sql_tronix" domain="FRA1_WPP1" />
      <element2 name="sql_edm" domain="FPEAST" />
      <element3 name="sql_edm" domain="EDMNT" />
      <element4 name="sql_ju" domain="MILLNET" />      
</root1>
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