ajax 12019错误,AJAX IE6 Status Code 12019

I am getting the following error when my Ajax Timer control tries to call the OnTick method in IE 6.

Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server.  The status code returned from the server was 12019.

I can also see the following javascript error afterwards -

Error: The download of the specified resource has failed

I have been reading other posts about this issue and tried many  of the suggested fixes but I am not having any luck.  Everything works fine in IE 7 and FireFox but does not work in IE6 or below.  I have even copied code from where the demo works in IE6

but it will not work in my web project.  It leads me to think I am missing some type of patch or setting is incorrect.  Here is my sample code and it is pretty basic.

-//W3C//DTD XHTML 1.1//EN""http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

Untitled Page

Here is my test ajax timer page.