Game freezing when I add custom weapons.

Game Modding | Call of Duty: Black Ops 3 | Asset Importing

Chroma:

So far I've added WWII and MWR custom weapons (thank you Skye) and it's worked fine, but if I try adding a third pack (I've tried IW, AW and BO2), it doesn't crash, but it just freezes, and I have to close it with the task manager. Is there a weapon limit or something?