End Google Ads 201810 - BS.net 01 --> Hi

I am getting the following compiler error in that the compiler can't find filea.cpp
I am using visual studio 2010 professional

The file appear in my project -> source files

When I right click in each of the .cpp source files and compile them Separately they each compile
cleanly including filea.cpp


Is there anyway to tell where this compiler error is coming from

Thanks