It appears that rfcore (or something else within RF 3.0 atm) causes a crash when environmental is updated to the 3.1.1 version.
There shouldn't be anything that causes a crash w/3.1.1 and yet it does, and in any case these would have to be fixed for if RF gets updated to 1.20 (which has been thrown around alot by you devs if I am not mistaken)

https://mclo.gs/corSFKI
Sorry if this isn't a good way to post the logs, I'll prolly post the raw file here tomorrow when I get the chance.
If at the very least I'd like to be able to understand what is causing the crash so I could perhaps make a patch of my own or whatever.

Newer versions of Environmental moved the armour materials to a different place. If RF was updated to 1.20, it'd be an easy fix, but to fix in in core at this point I'd need a way to load both the old and new version. I'll see if there's anything I can do.