Website - Error in web.config?

I just installed Orcas Beta 1, and now I'm seeing this error when I compile the website in both VS2005 and Orcas Beta 1:

C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Config\web.config(78): Build (web): Unrecognized attribute 'xmlns'. Note that attribute names are case-sensitive.

Also - websites are not my forte, so maybe I'm missing something. Where do I start to debug this issue?

I saw a couple posts that talk to this error - and they fixed this by editing the web.config file, which I'd like to avoid if possible.

Is this a known issue? Bug?

Thanks

--

Mike

[965 byte] By [michael.e.obrien] at [2008-2-14]