3 .cpp files in a visual studio project. Two of them cannot open stdafx.h?

I have a Visual Studio Project with 3 .cpp files and a few different header files.

I have checked that the stadfx.h file is included, and it can in fact be accessed by one of my .cpp files.

The other two however say that they cannot access the header file. Any advice on how to trouble shoot this? I cannot find a relevant question on this site.