Using Coop on ASP.NET website

Hi all. I am trying to set up coop on a website that uses ASP.NET. When searching the forum I found clead already created a solution*. Unfortunatly I cannot get it to work.

The included readme tells me to do the following:

I followed those steps (no problem there) and created a test page using the provided sample implementations**:

<%@ Register TagPrefix="CoopAds" Namespace="Coop" Assembly="coopad_260705" %>

<p>Coop Test</p>

<CoopAds:AdNet id="ads" runat="server" />

Code (markup):

Sometimes the pages loads and I get "The ad files is not writable." but most of the times it gives out the following error:

Server error in '/' application
Description: Error processing request.

Error Message: HTTP 500.

Stack Trace:

System.IndexOutOfRangeException: Array index is out of range.
in <0x00424> Coop.AdNet:Render (System.Web.UI.HtmlTextWriter Output)
in <0x000e2> System.Web.UI.Control:RenderControl (System.Web.UI.HtmlTextWriter writer)
in <0x000a4> System.Web.UI.Control:RenderChildren (System.Web.UI.HtmlTextWriter writer)
in <0x00021> System.Web.UI.Control:Render (System.Web.UI.HtmlTextWriter writer)
in <0x000e2> System.Web.UI.Control:RenderControl (System.Web.UI.HtmlTextWriter writer)
in <0x00417> System.Web.UI.Page:InternalProcessRequest ()
in <0x0010e> System.Web.UI.Page:ProcessRequest (System.Web.HttpContext context)

Code (markup):

The 'ad_network_ads.txt' has been given write permissions (666).

Someone else seems to had the same or a similar problem but no further replies or solution in the thread***.

Links: /* need another 9 posts before i can place them */
*http://www.vlead.com/misc/coopad_control.htm
**http://www.vlead.com/loadcode/coopad_control_sample.aspx
***http://forums.digitalpoint.com/showthread.php?t=7748

Any insight on how to fix this or use coop on ASP.NET in some other way is welcome.

Thanks in advance!