Log:
https://drive.google.com/file/d/1QkN_7dNr3nEiJoF-40mRKLKvxdJ1j4qO/view?usp=sharing

I'm getting this as well. I suspect this class being at fault here.

EDIT: Nope. Disabling the related option doesn't fix the crash.

I've confirmed the issue is not LoliASM. Disabling the mod does not stop the crash. Now to identify the actual culprit.

Does look very weird, I'll note this as invalid until you found the cause.

@Rongmario I still can't figure out why it still crashes and I have no clue :(

Maybe I had to sign Jar too?

Signing jars is optional unless you've provided an overriding classloader that somehow demands the jars to be signed.

I've isolated the cause as LittleFrames. Removing it allows loading the world. I'll report this to the dev there. I suspect the Watermedia library it uses is actually at fault.

EDIT: Watermedia 2.0.25 is broken. Use 2.0.24.