class MainFrame : public CFrameWnd    //Ошибка здесь
{
protected:                            
    MainFrame();                    
    ~MainFrame();
public:
    int OnCreate(LPCREATESTRUCT lpCreateStruct);
private:
    CStatusBar m_wndStatusBar;
    DECLARE_DYNCREATE(MainFrame);
protected:
    DECLARE_MESSAGE_MAP()
};