c#调用钩子函数,返回错误号为1008,怎么回事呀

[wahaccp]

MouseHookProcedure = new HookProc(MouseHookProc);
hMouseHook = SetWindowsHookEx(
WH_MOUSE_LL,
MouseHookProcedure,
Marshal.GetHINSTANCE(
Assembly.GetExecutingAssembly().GetModules()[0]),
0);