The problem is likely on your end. Our mod only has graphical and musical changes and should therefore not even be able to cause a crash like that. Furthermore, I've tested it myself using the workshop version of the mod and no one on our Discord has reported any issues like the one you're having.

Since you said that you made it to the country select screen with the map, I'm guessing you might have conflicting map mods on since the conflict they cause usually pop up when you try to load the map in the first place. Try to run the game again without any mods other than Kaiserreich and our mod and it should work.

Hepe that helps! Locking this thread now, please post further comments in the dedicated bug report thread if the problem persists.