error C2605 undeclared identifier

#define _AFXDLL
#include "afxwin.h"

class COurApp:public CWinApp
{
  public:
    virtual BOOL InitInstance();
};

class COurWnd:public CFrameWnd
{
  public:
    // Constructor
    COurWnd()
    {
      Create(0,L "our dumb window application");
    }
};

BOOL COurApp::InitInstance(void)
{
  m_pMainWnd = new COurWnd;
  m_pMainWnd->ShowWindow(m_nCmdShow); // ...and display it
  return TRUE;
}

COurApp AnApplication;