Minecraft Won't Launch (Version 1.12.2), Please Help!

Disclaimer, I don't know what "Affects Version/s" meant. I apologize for any inaccuracies!! I'm using Java 8.

When I go to launch Minecraft, I do it through Twitch since I'm playing a modpack in 1.12(RLcraft, if that helps!). I click play, and the icon for Minecraft comes up for a few seconds, the window pops up, then it shuts down and I get this log of text:

(Using pastebin so I don't flood the forum!)

https://pastebin.com/kdM61V3J

I've looked around everywhere, but nothing has helped. this came out of nowhere after I updated to Java 8. I also saw a post where someone suggested to delete the launcher_profile.json or something? But that didn't work. I'm sorry for being so informal, I'm just at a loss.

Anything helps, guys! Thank you so much.