Startup Issue with Minecraft - NeoForge will not start on Fresh Install

System Information

Field Value
Operating System Windows - Windows 11 Pro on x86_64
Product AMP ‘Phobos’ v2.6.4.2 (Mainline)
Virtualization None
Application Minecraft
Module MinecraftModule
Running in Container No
Current State Failed

Problem Description

Issue

I’m trying to setup a ATM10 To the Sky Minecraft server, but the Minecraft instance fails to start immediately with the following error:
Error: Could not find or load main class @libraries.net.neoforged.neoforge.21.1.215.win_args.txt

Looking at the support tab, the Las Args states the following:

-Xmx8196M -Xms256M @libraries/net/neoforged/neoforge/21.1.215/win_args.txt

Reproduction Steps

  • Created a new Minecraft Jave instance
  • In Configuration → Minecraft → Server Settings: Change Server Type to NeoForge and version to 21.1.215. Left Server JAR at [Autoselect]
  • Clicked Download/Update under Server type to allow instance to install NeoForge.
  • Waited for Installation process to complete
  • Returned to Status page and clicked Start
  • Accepted EULA

What Java version do you have selected?

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