Before Continuing:

• Check you are using the latest version of the mods and its dependencies
• Always include a latest.log if you are crashing
• Remove mod that enhances Minecraft: Optifine, Sodium, others. The issue persists.
• If you are unsure which mod is the culprit.
  Disable all of your mods and enable them 1-2 mods each time to isolate the culprit
• Confirm that there is no existing issue with a similar description submitted in the list of issues.

Version

1.21.1-NEOFORGE

Supplementaries Version

1.21-3.0.29-beta

Moonlight Lib Version

1.21-2.17.12

Describe Issue

Game crashes after upgrading from version 3.0.28 to 3.0.29. Tested with only moonlight and supplementaries.

Suspect issue related to commit: 7837683

crash log: https://mclo.gs/xaklWIG

You are not using latest mod version

If they've downloaded the mod from Modrinth, that is the latest version available for NeoForge found there.

You are correct, modrinth shows ver 3.0.30 but its not being offered as a download while trying to update via prism launcher. I manually downloaded and it's still not working.

Wait, its fabric only on modrinth. downloaded from CF and now its working with version 30

Closing