Possible Fixes

No

Modpack Version

2.3

What happened?

Game crash when starting, showing above mentioned error.

Crash Log

https://gist.github.com/KusanagiRyu/9288fcb7de17380bbaee54717bd5a057

Latest.Log

https://gist.github.com/KusanagiRyu/c1738e22b6f5fb73249dfbc22fce61cd

This has been an issue for a long time
architectury/architectury-api#528
One person suggests that adding -Duser.country=US -Duser.language=en to your args might solve the issue. Due to this being so hard to reproduce i can not verify that this works does not work
The usual go to solution has been to uninstall the game and the launcher completely, then reinstall.
Omega config has spent a long time in radio silence about this, the issue was put on their github half a year ago
Draylar/omega-config#26

yeah, that's true. I had such issue with other modpack. Sad to say, the args solution doesn't work.