Minecraft v1.12.2
Forge v14.23.5.2838
Charset Lib v0.5.6.3
Charset Barrels v0.5.6.3
Charset Chests v0.5.6.0
Charset Immersion v0.5.6.0

I got this crash while loading the game, not sure what causes it though.
Crash Report

Duplicate of #414.

Appears to be the same as #414 Do you have the latest NetherEx installed?

Yes