hey there @Kitkat_Matt, the error is definitely the cause of the mod “stonehearth expanded” as can be seen on that first line,
c++ exception: ‘stonehearth_expanded’ has no alias named ‘monster_tuning:undead:scaled_undead_zombie’ in the manifest.
this might be fixed with the newest “unstable” releases as i know that the team got a bunch of pathfinding optimizations done.