First time getting this one:

However I believe it's related to YACL getting an error, because without the YACL it works fine.

Here are related logs:

crash-2025-02-09_23.21.12-fml.txt
crash-2025-02-09_23.26.12-fml.txt

debug.log
latest.log

It is probably my fault, so please do not report it to YACL yet :D

Update to the latest NeoForge please.
Does this fix the error?

Update to the latest NeoForge please. Does this fix the error?

I'll try that sometimes later today (about after 3PM / 15:00 11th Feb 25)
Edit: If you mean NF 21.4.88, which I did update to (most likely on the 9th Feb) - based on the neoforge changelog, there shouldn't be any improvement? (https://neoforged.net/changelog/)

It is probably my fault, so please do not report it to YACL yet :D

[Verified] I reported this issue at YACL's Github before yours - however as of right now there is no reaction there, yet.

I probably know what causes this. Will post a dev build here later. But first I need some rest and sleep.

This is not caused by FancyMenu. It is caused by YACL not having its NeoForge build updated for the latest breaking changes in NeoForge 1.21.4.

See isXander/YetAnotherConfigLib#240 and isXander/YetAnotherConfigLib#242.

Will close this issue.