I'm getting "error C2440: 'static_cast' : cannot convert from 'LRESULT" etc

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C++

I am getting

error C2440: 'static_cast' : cannot convert from 'LRESULT (__thiscall CMyApp::* )(WPARAM,LPARAM)' to 'LRESULT (__thiscall CWnd::* )(WPARAM,LPARAM)'

The code in my header file looks like:

class CMyApp : public CWinApp
{
public:
	LRESULT OnMsg28(WPARAM, LPARAM); 

The code in the program looks like:
BEGIN_MESSAGE_MAP(CMyApp, CWinApp)
//{{AFX_MSG_MAP(CMyApp)
ON_MESSAGE(WM_MSG28, OnMsg28)

and

LRESULT CMyApp::OnMsg28( WPARAM wParam, LPARAM lParam ) 
{
	static int	zero=0, one=1;
	int			rc;

<code>
	return 0;
}

I have used code like this many times in the past but this is the first time I am running into this problem. I googled this and tried several suggestions but ended up with the same results.