Before this problem, I was playing on 1.10.2. and most things were fine (including Galacticraft). Upgraded to 1.12.2. and now game crashes on world load.
Here's the log: https://pastebin.com/49y1QXvT
Playing on forge-1.12.2-14.23.5.2836
Here's the log: https://pastebin.com/49y1QXvT
Playing on forge-1.12.2-14.23.5.2836