I installed it and launched it everything loads but it shows the other zombie maps cod comes with. And nothing to load the modded map. Any help?

I installed it and launched it everything loads but it shows the other zombie maps cod comes with. And nothing to load the modded map. Any help?

try to unload the map then launch the map again, click on zombies, then the custom zombies tab and u should see the map

Hello,
 
I used to enjoy this map with no issues but trying to play it lately has been difficult. I keep getting crashes randomly when playing. This happens around 45+ mins in the map and I am not sure why.
 
The error code I get is, d:\code\projects\c++\linkermod\components\game_mod\com_memory.cpp(9):
 
Any help would be appreciated. This is by far my favorite BO1 map.