First time seeing this error (After having played Minecraft for many, many years) and I have no clue what seems to be breaking. I've tried using the methods people have suggested to others but I always seems to have more errors.
So far the game output has been helpful in at least seeing that I have errors, and I have gone and removed multiple mods that seemed to have causes them, but yeah.
I've got the log from once I start World generation here, but if you need more just tell me.
https://jpst.it/3ad8S
Obviously, thank you kindly for any help you may provide.