I'm fairly new to DNN module development, and this is my first attempt at creating a module containing AJAX code.  For testing purposes, I'm trying to create a module using a simple accordion (later this will be data-driven).

Here's the code:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="EquityResearch.ascx.cs"

Inherits="DesktopModules_EquityResearch_EquityResearch" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">

</asp:ToolkitScriptManager>

<asp:Accordion ID="Accordion1" CssClass="accordion" HeaderCssClass="accordionHeader"

HeaderSelectedCssClass="accordionHeaderSelected" ContentCssClass="accordionContent"

RequireOpenedPane="false" SelectedIndex="-1" runat="server">

<Panes>

<asp:AccordionPane ID="AccordionPane1" runat="server">

<Header>

Consumer Services</Header>

<Content>

Autozone, Inc.<br />

BJ's Restaurants, Inc.<br />

Bob Evans Farm, Inc.<br />

</Content>

</asp:AccordionPane>

<asp:AccordionPane ID="AccordionPane2" runat="server">

<Header>

Energy</Header>

<Content>

Allis-Chalmers Energy, Inc.<br />

Basic Energy Services, Inc.<br />

Berry Petroleum<br />

</Content>

</asp:AccordionPane>

<asp:AccordionPane ID="AccordionPane3" runat="server">

<Header>

Financial Services</Header>

<Content>

BancorpSouth, Inc.<br />

BB&T Corporation<br />

Compass Diversified Holdings<br />

</Content>

</asp:AccordionPane>

<asp:AccordionPane ID="AccordionPane4" runat="server">

<Header>

Healthcare</Header>

<Content>

Alliance Healthcare Services<br />

Allscripts Healthcare Solutions, Inc.<br />

athenahealth, Inc.<br />

</Content>

</asp:AccordionPane>

</Panes>

</asp:Accordion>

When I try to install the module, the only error I get is:

A critical error has occurred.
Object reference not set to an instance of an object.

Can anybody point me in the right direction?  Thanks!