There's definitely a problem, with this:
[MODEL_REPLACEMENT_0]
FILE = ?.kn5
HIDE = Box005, Box179, Box195, Box177, Object76470, Object76469, House_001_?, House002_?, House_002_?, House_modern_?, house_2015_?, House006_?, House008_?, House004_?, House005_?, House007_?, PUB_?, hotel_?, mansion_?, gazebos_?, Box137, Mesh002, Mesh005, Mesh013, Mesh016, Mesh017, Mesh019, Mesh047, Mesh048, Wharehouse_?, Object439, Mesh040, RailClone?, Object76449, cars_?
INSERT = ks_highlands__buildings.kn5
INSERT_AFTER = bush_HI_1
That ks_highlands__buildings.kn5 is now a 1 KB file, so those lines hide the buildings but have nothing to replace them with.