In section01.cpp, you have the following:
#include "fbull.h"
#include "stdafx.h"
Just swap the order of these includes, so that it becomes like this:
#include "stdafx.h"
#include "fbull.h"
It should probably work now. “stdafx.h” should generally be the first include in the list, or weird errors might happen.
Note that, to make things simpler and less painful, you could have created the project without Precompiled Headers, which is what “stdafx.h” is about. If you want to disable them, so that you do not need to include “stdafx.h” anymore, follow my instructions in the following link: