MFC中自定义线程消息出错了,该如何处理

MFC中自定义线程消息出错了
错误：error C2440: 'static_cast' : cannot convert from 'void (__thiscall CCThread::* )(void)' to 'void (__thiscall CWinThread::* )(WPARAM,LPARAM)'

指向的语句是：
ON_THREAD_MESSAGE(WM_USERTHREADMSG,OnUserThreadMSG)//自定义线程消息的映射宏


这是怎么了？

[解决办法]
未映射