Pop Up Control Extender + Web service call failed:12030/ 500

[johnsonlim026]

Hi , i encounter this in using Pop Up Control Extender inside a gridview.My coding is as below
coding in aspx

 <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4"
            DataKeyNames="empcode" ForeColor="#333333" GridLines="None">
            <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
            <Columns>
                <asp:BoundField DataField="empcode" HeaderText="empcode" ReadOnly="True" SortExpression="Name" />
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:Image ID="Image1" runat="server" ImageUrl="~/Image/magglass.jpg" />&nbsp;
                        <cc1:popupcontrolextender 
                        ID="PopupControlExtender1" 
                            runat="server" 
                            DynamicServiceMethod="GetDynamicContent"
                            DynamicContextKey='<&#37;# Eval("empcode") %>'
                            DynamicControlID="Panel1"
                            TargetControlID="Image1"
                            PopupControlID="Panel1"
                            Position="Right"
                            >
                        </cc1:popupcontrolextender>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="empname" HeaderText="empname" SortExpression="Title" />
                <asp:BoundField DataField="telno" HeaderText="telno" SortExpression="Address" />
            </Columns>
            <RowStyle BackColor="#EFF3FB" />
            <EditRowStyle BackColor="#2461BF" />
            <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
            <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
            <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
            <AlternatingRowStyle BackColor="White" />
        </asp:GridView>
        <asp:Panel ID="Panel1" runat="server">
        </asp:Panel>

vb coding is as below:

Private Sub populateGridView()
        Dim str As String
        Dim ds As New DataSet

        dbconn.Conn.Open()

        str = "select empcode,empname,telno from employee limit 5 "

        ds = dbconn.SelectQuery(str, dbconn.Conn)
        Me.GridView1.DataSource = ds
        GridView1.DataBind()

    End Sub

Protected Sub GridView1_RowCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowCreated
        If e.Row.RowType = DataControlRowType.DataRow Then

            Dim pce As PopupControlExtender
            Dim behaviorID As String
            Dim i As Image
            Dim OnMouseOverScript As String
            Dim OnMouseOutScript As String


            pce = e.Row.FindControl("PopupControlExtender1")

            behaviorID = String.Concat("pce", e.Row.RowIndex)
            pce.BehaviorID = behaviorID

            i = e.Row.Cells(1).FindControl("Image1")

            OnMouseOverScript = String.Format("$find('{0}').showPopup();", behaviorID)
            OnMouseOutScript = String.Format("$find('{0}').hidePopup();", behaviorID)

            i.Attributes.Add("onmouseover", OnMouseOverScript)
            i.Attributes.Add("onmouseout", OnMouseOutScript)
        End If

    End Sub
<System.Web.Services.WebMethodAttribute(), System.Web.Script.Services.ScriptMethodAttribute()> _
    Public Function GetDynamicContent(ByVal contextKey As String) As String

        Dim sTemp = New StringBuilder()


        sTemp.Append("<table>")
        sTemp.Append("<tr><td><b>Territories:</b></td></tr>")

        sTemp.Append("<tr><td>" + "zxczc" + "</td></tr>")

        sTemp.Append("</table>")

        Return sTemp.ToString()
    End Function

Does anyone has idea on this, i have try few ways like adding a web services call myWebServices.asmx where it's location is same as the web pages and having DynamicServicePath="CourtService.asmx" in pop up control extender. But it still bring me to the same error.