Attempting to use Iron's Spellbooks as a dependency for my mod (which depends on PlayerAnimator), but was getting crashes when running client from IDE.

Narrowed it down to PlayerAnimator - crash occurs when no other mods are loaded (other than my mod in progress, which currently does nothing, it's a blank mod).

Crash report

Full console log

Game version is 1.20.1, Forge version is 47.3.1, PlayerAnimator version 1.0.2

Edit: Apologise in advance if this is something on my end, I'm just puzzled and nobody on the Modded MC Discord could figure it out either. You're my only hope, thanks in advance

I can verify the same issue. Seems the lib gets all weirded out by something.

Having a similar issue on 1.20.4 fabric, works fine when i export my mod and launch it outside the dev environment.

Also having the same issue on Minecraft Fabric 1.21.