No circular references, but undeclared idenifier

Each of my header includes is protected by directives
I think I don't have to include Boolean in my work space because it is already included
in the external dependencies section. and the Boolean.h is in the include path.

MachineShop, Boolean etc got undeclared identifier error
Tried to comment out the directives, to no avail.
Thanks
Jack

Code:

---

/*
 * Copyright (C) 1994
 *
 * Department of Computing Science,
 * The University,
 * Newcastle upon Tyne,
 * UK.
 */

#include <iostream>
#include <string.h>



#ifndef BOOLEAN_H_
#  include "Boolean.h"
#endif

#ifndef PROCESS_H_
#  include "Process.h"
#endif

#ifndef MACHINESHOP_H_
#  include "MachineShop.h"
#endif

#include "stdafx.h"

using namespace std;

int main (int argc, char** argv)
{
    Boolean isBreaks = FALSE;
   
    for (int i = 0; i < argc; i++)
    {
        if (strcmp(argv[i], "-help") == 0)
        {
            cout << "Usage: Main -breaks -help" << endl;
            return 0;
        }
        if (strcmp(argv[i], "-breaks") == 0)
            isBreaks = TRUE;
    }

    Thread::Initialize(); // Initialize the threads package.

    /*
    * We don't need to call Resource::ref on m as it is created on
    * the stack. However, it would not cause any problems to do so,
    * and if objects are passed by pointer we may not know that one
    * has not been created on the heap. So, whenever we have a pointer
    * we will always call ref and unref before use.
    */

    MachineShop m(isBreaks); // Start up the real main body of the simulation.

    m.Await();              // Suspend main's thread (NOTE: this MUST be done
                            // by all applications.)

    m.Exit();                // Reactivate main thread and then exit
   
    return 0;
}

---

Code:

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#include "stdafx.h"

---

must be the first #include

Magic!