Startup Issue with Minecraft - The server will not start because of mods

[Madeline_L]

System Information

Field	Value
Operating System	Linux - Debian GNU/Linux 12 on x86_64
Product	AMP ‘Callisto’ v2.5.1.0 (Mainline)
Virtualization	Docker
Application	Minecraft
Module	MinecraftModule
Running in Container	Yes
Current State	Failed

Problem Description

Issue

The server won’t start after adding mods. This didn’t seem to be a problem until after I updated AMP. I even tried making a new instance and starting fresh, but it still doesn’t work. As soon as I add mods, the server stops working. It can’t be the mods’ fault because the server ran with these mods before and my own Minecraft game runs fine with these same files. The console says “Caused by: cpw.mods.niofs.union.UnionFileSystem$NoSuchFileException: io” when this happens.

Reproduction Steps

• Make a minecraft server
• Make it run on forge (47.3.1) (Minecraft version 1.20.1)
• Start the server - it works fine
• Add mods to the mod folder (origins and caelus)
• Try to start the server again but it won’t start.

[Mike]

@CubeCoders-Bot I suspect the issue here is permissions. Walk the user through fixing the permissions using ampinstmgr, and then follow up if necessary.

[CubeCoders-Bot]

Alright, let’s start by fixing those permissions. You’ll need to run ampinstmgr fixperms as root. Here’s how to do it:

1. Switch to the root user:

   sudo su -
   

2. Run the fixperms command:

   ampinstmgr fixperms
   

Once you’ve done that, try starting the server again and let me know if the issue persists .

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