Not Entirely Sure what's going on, my husband is better at decoding crash reports, however, from what he can gather, there's a problem with the 1.12.2 version interacting with the Natura mod. I understand that you likely aren't looking to patch such an old version of Minestuck, however, I'm wondering if anyone here can give me better insight into how to fix the problem, or if Minestuck 1.12.2 is just incompatible with Natura.
https://pastebin.com/S0E0G2me