有哪位高人教教小弟如何在单机Left 4Dead 2用秘籍

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小弟请教各位高手们如何在单机模式下用秘籍啊！因为小弟输入秘籍就会出现这两串英文：
Can't use cheats now; please exit to main menu and start your own listen server with "map mapname" so that you could enable cheats.
然后小弟我~按MAP_c1m1_hotel在输入sv_cheats 1 god 1就会出现
Can't use cheat cvar god in multiplayer, unless the server has sv_cheats set to 1.或Can't use cheats now; please exit to main menu and start your own listen server with "map mapname" so that you could enable cheats.
这是为什么了？[em30] [em30] [em30] [em30] [em30]