Route your belts freely underground.
Mods introducing new content into the game.
Augmented or new ways of transporting materials - belts, inserters, pipes!
When ever i have this mod enabled i get this message https://ibb.co/XWvPyCS
What other mods are you running? Looks like something that offers "replication?"
I am a fool who forgot the fact mods might be incompatible with eachother. I found out which one it was its this one: https://mods.factorio.com/mod/WipMod_HeavyTank
Thanks for the help