Using VS.Net 2005.

I have a solution that contains 4 projects. Project 1 has a reference to project 2, and project 2 has a reference to project 1.

I have always been able to rebuild my solution, but today I can't rebuild my solution. It looks like project1 DLL and project2 DLL has been deleted and since they reference each other, my solution won't build because the DLLs don't exist.

What can I do to get my solution to build?

Thanks,

Jerry