Hello!

I've been using the mod tools to create my own custom culture, but I haven't been able to playtest it as using the Build and Run feature leads to the game freezing on the loading screen and applying the mod through steam crashes the game the moment I apply it. I am completely new to modding and unity, but I'm really having trouble figuring out what's wrong with my mod. I get this error message when the game crashes, which is very confusing to me. 

I've spent a few hours looking around to try to fix this, but I haven't been able to figure it out. Does anyone have any experience with this issue? Thanks.