Customization with Minecraft - universal.jar files do not work

System Information

Field Value
Operating System Linux - Ubuntu 20.04.6 on x86_64
Product AMP ‘Phobos’ v2.6.2.0 (Mainline)
Virtualization None
Application Minecraft
Module MinecraftModule
Running in Container No
Current State Ready

Problem Description

Issue

I am trying to make my own minecraft server but the cursedforge mods are not all working. For example any mod with just jar works but when loading it with universal.jar they break. also when trying to boot the server into a universal it crashes.

Reproduction Steps

  • minecraft server with 1.12.2 modded with 14.23.2860
  • changed the java loader thing to java 8. downloaded a server instance from cursed forge for 1.12.2 servers.
  • then loaded in but any time i have universals in the mods it flips out saying fatal enties missing

See this guide here, Forge 1.12.2 works fine when configured correctly.
https://discourse.cubecoders.com/t/setting-up-a-modded-java-minecraft-server/26535