Latest version members_ Extended_ Life-1.21.0 is incompatible with AetherWorks-1.12.2-1..0.3
debug.log
latest.log

Quick update. I restored compatability with Aetherworks, but I tested another addon in parallel: Aetherium Ashen Armor, which still crashes with my fork of embers as soon as this get's fixed I'll publish another BETA release on curseforge.

Provably related to our registry refactor and the same reason it's incompatible with soot and a few other addons.
Don't worry integrating most of the addons is our next big milestone. (You'll still be able to disable every addon you don't want to use.)