Unfortunately there seems to be a bug in the 15.5 base-game. I double checked all the graphics and they should be fine. So I can't do anything right know to fix it as far as I know - we'll have to wait till it gets fixed in the base game...
I'm on it and update as soon as I can...

Cheers,
Phalke

I uploaded a version that at least doesn't crash the game anymore, it only leads to the mod being disabled. That way it can be auto-updated when it gets fixed...

I'm not sure if the following bug is related to what you're encountering, but it relates to the non-functionality of the mod currently - For the file "prototypes/base_mod/entity/transport_belt.lua", it complains of one of the icon_size variables not being an integer. Consequently, the only option it gives you is to disable the mod.

I checked and on line 283 there's a line that reads "icon_size = {32, 32}". Once I changed that so that it read "icon_size = 32", the game started perfectly fine. And now the only graphical issues I'm having is with a different mod I just installed (specifically the ZRecycling mod).

That's weird, because it does not work for me that way. I added the "wrong line" on purpose, because otherwise my whole game would crash, with the "wrong" line only the mod gets disabled because of the incorrect syntax...
I'm glad it works for you at least, but there still seems to be something odd...