Possible Fixes

Yes

Modpack Version

1.2

What happened?

I updated from 1.1 to 1.2 and get an error message (images attached).

latest.log

https://gist.github.com/alpha-pvp/5bbb72b7289d53d6485a6a60b33dd0f2

Developer reports

No response

I am also getting this error. This affects 1.2 and 1.3 as far as I can tell. I can't start a new world on these versions either, the game immediately crashes. I tried more ram, around 13 GB's, but that didn't work either. Would love to see this fixed in 1.4!

EDIT:
Found a workaround. This could very well just be an issue with AT Launcher. I switched to curseforge, downloaded the latest atm10 version, and swapped the world saves over, and it worked. The game stalled when loading in / creating a world, but it did not immediately crash like AT launcher did. Hope this helps.