I was on NGTZombies and I seen this map and i was like cool ill check it out but when i downloaded it i installed it  and all that but when i opened WaW i opened the mods loaded it up but it doesnt let me play the map? please help me out.

I was on NGTZombies and I seen this map and i was like cool ill check it out but when i downloaded it i installed it  and all that but when i opened WaW i opened the mods loaded it up but it doesnt let me play the map? please help me out.