I am trying to compile a C++ .net project that I inherited. When I try to compile the solution, I get a bunch of the following errors.

///
C:\PalmCDK403\C++\Samples\GenCns\GenCn\Src\bckupmgr.cpp(33): fatal error C1083: Cannot open include file: 'bckupmgr.h': No such file or directory
///

The compiler reports that about 10 of these .H files do not exist. However, they do exist and they are in the specified directory. I have even removed these files from the project and added them again. Still I get these errors.

What could cause these errors and how can I fix them?

Thanks,

Jerry