HWND CreateWindow(      

    LPCTSTR lpClassName,
    LPCTSTR lpWindowName,
    DWORD dwStyle,
    int x,
    int y,
    int nWidth,
    int nHeight,
    HWND hWndParent,
    HMENU hMenu,
    HINSTANCE hInstance,
    LPVOID lpParam
);
lpClassName stand for name of window classname,The explain are as Follow:
[in] Pointer to a null-terminated string or a class atom created by 
a previous call to the RegisterClass or RegisterClassEx function. 
The atom must be in the low-order word of lpClassName; the high-order
 word must be zero. If lpClassName is a string, it specifies the
 window class name. The class name can be any name registered with 
RegisterClass or RegisterClassEx, provided that the module that 
registers the class is also the module that creates the window. The 
class name can also be any of the predefined system class names.
 For a list of system class names, see the Remarks section
问题:hWnd=(HWND)CreateWindow("WinFill","填充示例程序",...
弹出如题目所示的错误,希望能得到各位高手的提示!!