Game crashed after installing the newest version of FairFactions.
Crash report: https://pastebin.com/ttFJhz10

I also get the same problem.
https://paste.ee/p/fcMOR

I also get the same crash with a similar crash log.
https://pastebin.com/CPqQMNkj

Found the issue, the jar available on Curse is corrupt. I've disabled that download and am uploading a new build that works, 0.5.2c (md5: 1d9f11f1b386db5e2eed146e21fbcb60).

I'm re-creating my 1.7.10 dev environment now, will see what I can do on this today.

I compiled this against forge 1558, but it looks like at least two of you are running 1614. I don't think there should be any incompatibility, but am starting my examination there.