Error executing child request for handler 'System.Web.UI.Page'.

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VB

jQuery

my usercontrol is register in master page. there is a div in master page when i hover over that div my webmethod LoadCommunicationGrid() which supposed to bind the gridview control but it gives following a error.
Error executing child request for handler 'System.Web.UI.Page'.
UserControl(.ascx)

<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="TEAMEICCOMMUNICATION.ascx.vb" Inherits="RBSS.TEAMEICCOMMUNICATION" %>

    <asp:GridView ID="gridCommunicaiton" runat="server" AutoGenerateColumns="false" GridLines="None"
        AlternatingRowStyle-CssClass="odd" RowStyle-CssClass="even" Width="436px" Style="color: Black">
        <HeaderStyle CssClass="gridHeader" HorizontalAlign="Left" />
        <Columns>
            <asp:TemplateField HeaderText="Date" HeaderStyle-HorizontalAlign="Left" ItemStyle-HorizontalAlign="Left">
                <ItemTemplate>
                    <asp:Label ID="lblDate" runat="server" Text='<%# Eval("EXFB_DATE") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Comments" HeaderStyle-HorizontalAlign="Left" ItemStyle-HorizontalAlign="Left">
                <ItemTemplate>
                    <asp:Label ID="lblComments" runat="server" Text='<%# Eval("EXFB_COMMENT") %>'></asp:Label>
                    <%--<asp:LinkButton ID="ReadMoreLinkButton" runat="server" Text="More" CommandArgument='<%#Eval("EXFB_ID")%>'
                        OnCommand="ReadMoreLinkButton_Click"> </asp:LinkButton>--%>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

.aspx.vb code

<WebMethod()> _
    Public Shared Function LoadCommunicationGrid()
        Using page As New Page()
            Dim userControl As UserControl = DirectCast(page.LoadControl("~/UserControl/TEAMEICCOMMUNICATION.ascx"), UserControl)
            page.Controls.Add(userControl)
            Dim dtList As DataTable = clsCommon.ListRecommendation(clsAuth.GetEXTMID)

            TryCast(userControl.FindControl("gridCommunicaiton"), GridView).DataSource = dtList
            TryCast(userControl.FindControl("gridCommunicaiton"), GridView).DataBind()
            page.Controls.Add(userControl)
            Dim writer As New StringWriter()
            page.Controls.Add(userControl)
            HttpContext.Current.Server.Execute(page, writer, False)
            Return writer.ToString()

        End Using
    End Function

jQuery

function ShowGrid() {
    $.ajax({
    type: "POST",
    url: "demo.aspx/LoadCommunicationGrid",
    data: '{}',
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function (r) {
        $("#showCommunicationGrid").show();
        $(".hoverCountMessage").hide();
        $(".Records").hide();
        $(".showCancel").show();       
    }
});
}

$(".hoverCountMessage").mouseenter(function () {
   ShowGrid();   
});