Whether you register the NET 2.0 or 1.1 project, you should navigate to
http://localhost/Build/Default.aspx, not
http://localhost/Build/NET1.1/Default.aspx. If you register the .NET 2.0 project and then navigate to
http://localhost/Build/NET1.1/Default.aspx, you will encounter the error. Don't do that (see links in my previous post).