Customization with Minecraft - Server shows the message "undefined" when upload mods

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 Ready

Problem Description

Issue

This is my first server and I don’t understand what happen, I can load all the mods in my minecraft but when I try to upload the mods, it dont work, I dont know if i need to upload each mod or is enough with a .rar

Reproduction Steps

  • I uploaded some mods individually
  • I waited and when the process was about to end, shows the message
  • I push “ok” but the mod can’t continue uploading about hours

AMP doesn’t support rar, only zip.
Upload stuff over SFTP