The project file ' ' has been renamed or is no longer in the solution

Had this problem today with Visual Studio 2005. When you try and build, all you get is the following error message:



Luckily, I found this which solved the problem for me. Thanks Michiel!

Specifically, the error was caused by running NetTiers and specifying not to generate the web library. It still seems to generate the website project which recerences the non-existent web library.