Find en fejl i Visual C++ 6 program

Denne her kodestump:

#include <afxwin.h>

class CMainFrame : public CFrameWnd
{
public:
    CMainFrame ();

protected:
   
    DECLARE_MESSAGE_MAP()
};

CMainFrame::CMainFrame()
{
    // Create the window's frame
    Create(NULL, "Windows Application", WS_OVERLAPPEDWINDOW,
          CRect(120, 100, 700, 480), NULL);
}

class CExerciseApp: public CWinApp
{
public:
    BOOL InitInstance();
};

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)

END_MESSAGE_MAP()

BOOL CExerciseApp::InitInstance()
{
    m_pMainWnd = new CMainFrame ;
    m_pMainWnd->ShowWindow(SW_SHOW);
    m_pMainWnd->UpdateWindow();

    return TRUE;
}

CExerciseApp theApp;

Giver denne her fejlmeddelelse:

--------------------Configuration: Messages1 - Win32 Debug--------------------
Compiling...
Exercise.cpp
Linking...
nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __endthreadex
nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __beginthreadex
libcd.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/Messages1.exe : fatal error LNK1120: 3 unresolved externals
Error executing link.exe.

Messages1.exe - 4 error(s), 0 warning(s)

Jeg kan ikke selv finde fejlen. Håber at der er en anden der kan.