I have around 800+ hours on a world in foolcraft3 version 1.5.4
I found that i can use a auto crafting multi structure instead of like 100 craters from refined storage.
So i immediately built the max size for the multi structure of 16x16 and i was able to put all my patterns in.
After a few minutes my game crashed and i can no longer load into the world.
I made a new world and attempted to recreate the problem, as soon as i placed down any of the multi structure blocks (i.e frame) i get an error from Refined Avaritia.

report link i was given https://paste.dimdev.org/cequlolegu.mccrash

Go report this to refined avaritia

Nothing to do with us, sorry.