am trying to create/consume a basic webservice. I've done this a
zillion times, but now I can't.

I created a new "ASP.NET AJAX Futures Web Application" within Visual
Studio 2008 Beta 2. In addition, I have the following installed:

-Windows XP SP2

-Microsoft ASP.NET 2.0 AJAX Extensions 1.0

-Microsoft ASP.NET Futures (July 2007)

I have created a new project of the type mentioned above and I add NO
code. I try to run it as is and I receive the following error:

"The base class includes the field 'ScriptManager1', but its type
(System.Web.UI.ScriptManager) is not compatible with the type of
control (System.Web.UI.ScriptManager)."

How do I fix this error?