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

supplementaries-1.21-3.1.0-neoforge

Moonlight Lib Version

moonlight-1.21-2.18.2-neoforge

Describe Issue

crash-2025-03-31_15.37.34-fml.txt

Duplicate of #1450

This is already fixed. Please check for a similar issue via "Closed"

TEMP SOLUTION

go inside the JAR using 7zip and go to ~/META-INF/mods.toml

open the file and remove code block for "create". it should be easy for you to find it. then with that, you can launch Minecraft.

idk when Supplementaries with the fixed mods.toml will be uploaded to CF/MR (Curseforge/modrinth)