goldenage combat crashes when loading, .minecraft file works fine on different PC.

latest (6).log

Looks like you're using the 1.18.1 version on 1.18.2.

it is the 1.18.2 version, also it works fine on another (linux) computer that is running 1.18.2

The version listed as latest on Curse is the 1.18.1 version unfortunately. The missing method referenced in the log does indeed only come up in the 1.18.1 version, so you must have accidentally downloaded that version.

Can you just try again with the original PC using this version? https://www.curseforge.com/minecraft/mc-mods/golden-age-combat/files/3671444