Customization with Minecraft - "undefined" popup when trying to add mods

Technical Support
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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 Stopped

Problem Description

Issue

I have followed all modding instructions, but when I try to transfer the mod files over to the “mods” directory, sometimes I get an “undefined” error and the download freezes and gets an absurdly slow download speed.
It happens only with some mods, while others are able to be installed.

Reproduction Steps

  • changed to Forge and the appropriate version in configuration
  • Added mod directory to file manager
  • try to add mod files
2

Use the SFTP option with an SFTP client such as Filezilla or WinSCP instead.

3

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