Hey guys. I'm experiencing a very annoying issue, I think it has been caused from messing around with the User aliases file because the error I'm getting when I link my map is:

"E:\SteamLibrary\steamapps\common\Call of Duty Black Ops III\\sound\snd_convert.exe"  pc usermaps\zm_doom usermaps\zm_doom zone_source usermaps\zm_doom all zm_doom
ERROR: E:\SteamLibrary\steamapps\common\Call of Duty Black Ops III\share\raw\sound\aliases\user_aliases.csv
ERROR: Index was out of range. Must be non-negative and less than the size of the collection.
ERROR: Parameter name: index
unchanged...done: 0m1.82s

If I run the map, the game will encounter an unexpected error and crash. If I load up Black Ops 3 and click on my map through the map select, I get something about not being able to load the fastfile, this also occurs with the zm_giant map that comes with the mod tools and I haven't modified that at all.

Any help would be greatly appreciated.

I believe i have had this problem before and i forgot how to fix it, but try verifying your cache in steam and if that doesnt work, where it says the error is, go to that folder and check to see if anything is out of place.