Hi there!
We think we can help you figuring this one out.
Could you please tell us whether './web_site/' folder contains web.config? The reason we ask is that ASP.NET won't load an ASP.NET app from the folder that has no web.config in it. So if you registered your application's root as c:\app, then c:\app folder must contain at least web.config. If in this case c:\app\ws folder has some.asmx, then you should be fine - it would map to the http://host:port/ws/some.asmx.
Also it might help if you tell us what type "Could not create type..." was complaining about: yours or ours/Framework's.
Please let us know if this has helped.
Best regards,
UltiDev Team.
Please donate at
http://www.ultidev.com/products/Donate.aspx to help us improve our products.