Krutoy242

> Regarding this error, I have received report from players in my modpack a long time ago, but it is very rare, but you can try downgrading the [HammerCore/HammerLib](https://www.curseforge.com/minecraft/mc-mods/hammer-lib) mod...

The issue could be also related to this config option: 

> Alright so I've attempted to start the pack again with the suggested change, and now I'm getting this crash on load consistently: [mclo.gs/kpvDCXQ](https://mclo.gs/kpvDCXQ) . It _appears_ to be related...

Good. I will consider to downgrade HammerCore then.

> Regarding this error, I have received report from players in my modpack a long time ago, but it is very rare, but you can try downgrading the [HammerCore/HammerLib](https://www.curseforge.com/minecraft/mc-mods/hammer-lib) mod...

The error itself happens randomly and fixed by changing mod count / mod versions. Since I cannot reproduce this issue and no players reported this issue last months, probably its...

Reopen issue since new player reported same issue today https://mclo.gs/4lW4Dtf

Update: Seems like SledgeHammer wasnt the reason because today i found a player who had error `NoClassDefFoundError: VertexLighterFlat` without SledgeHammer https://mclo.gs/TH8yjpr

Should be fixed in [next modpack version](https://www.curseforge.com/minecraft/mc-mods/hammer-lib) through this commit https://github.com/dragon-forge/HammerLib/commit/aeb705eaf3198d685c19b8a0db569b303af7d740

Should be fixed in https://github.com/Krutoy242/Enigmatica2Expert-Extended/releases/tag/v1.43.0