Modpack version:
2.9.1

Java version:
Latest

Description:
I can't launch my game, a fatal error has occuried

When did the crash happen?
When entering i nthe world

Steps to reproduce:
Open the game / Start the modpack / Get into a world / ...

Minecraft crash report:
latest.log

How much RAM did you dedicate to your client and how much RAM does your PC have?
I dedicated 10 GBs and my PC has 16 GBs of RAM.

Screenshots:

I crash after that

Additional context:
I was in the nether, doing some exploration quest

in your log, Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_51. that version is five years old. please update your java, and make sure it actually updated.

I don't understand why I am having trouble now when I have had it before.

Isn't it more because of a backup problem?

When I open another backup I have no problem.

Crash with MultiMC too.

I downloaded the latest version of java on https://www.java.com/

but is still crashing.

(Sorry it's in french. )

just because you downloaded it, doesnt mean you're using it. curseforge ignores it to always use 0_51. switch to multimc.

Could you join the discord https://discord.gg/Hg4qsmRQ and ask for help in the tech-support channel, where help can be more easily rendered?