@Arcaion

It seems there might be a bug or some corruption in assets like armor or weapons in your mod :

get_object failed for mesh: flag_spears
get_object failed for mesh: flag_skirmishers
get_object failed for mesh: flag_horseman
get_object failed for mesh: flag_d7
get_object failed for mesh: flag_d8
get_object failed for mesh: flag_d9

Its in color red text.
It had something to do with a bad upload in steam workshop.
It just shows up when you boot a battlescene every time you open the game.