How to Download Chunky Pregen from Curseforge?

[yottabit42]

I've been trying to add the Chunky Pregen mod from Curseforge so that I can pregenerate the world, but the container always gives me an error for the download.

The mod is this one: Chunky Pregenerator Forge.

Here is what I have tried in the compose file (one at a time):

CURSEFORGE_FILES: |-
  chunky-pregenerator-forge
...
CURSEFORGE_FILES: |-
  https://www.curseforge.com/minecraft/mc-mods/chunky-pregenerator-forge
...
CURSEFORGE_FILES: |-
  https://www.curseforge.com/minecraft/mc-mods/chunky-pregenerator-forge/download/7323694

These always result in a similar error:

mc-1  | [mc-image-helper] 10:27:26.677 ERROR : Invalid parameter provided for 'curseforge-files' command: Unable to find match in latest files for chunky-pregenerator-forge

And I tried with the regular mods download directive, too:

MODS: |-
  https://www.curseforge.com/minecraft/mc-mods/chunky-pregenerator-forge/download/7323694

That one resulted in a 403 forbidden of course, because it was trying to download without using the API key:

mc-1  | [mc-image-helper] 09:29:41.793 ERROR : 'mcopy' command failed. Version is 1.51.1: FailedRequestException: HTTP request of https://www.curseforge.com/minecraft/mc-mods/chunky-pregenerator-forge/download/7323694 failed with 403 Forbidden: Getting file

What I have not tried is linking the .jar mod directly into the container yet, because I would ideally like the container to download the latest from CurseForge all the time, so I don't have to manually update it.

What am I doing wrong?

Thank you!

[itzg]

Please provide your full compose file since

Unable to find match in latest files for chunky-pregenerator-forge

Means you're requesting a mod that doesn't have a designated version for the requested VERSION + TYPE.

Providing the slug ID and file ID directly will bypass their compatibility query.

[yottabit42]

Here are all of the files from the mod page on CurseForge. I guess I can match up the "game version" and "mod loader" but how do I find the slug ID and file ID?

Your comment gave me some hints. This is an old mod, and looks like it's using game version 1.12.2, but the Chunky Pregen mod does not list a version with the same game version. Is this why it is not auto-downloading?

Thank you so much for your help. Your container is awesome, and so much easier than manually running mods in jails like I was doing before. I still have problems getting some mods to properly start, but I will create a new question for that sometime.

Here is the full compose file, with the mod currently commented out:

# Generated by setupmc.com on 2026-01-29T01:35:15.733Z

services:
  mc:
    image: itzg/minecraft-server:java8
    tty: true
    stdin_open: true
    ports:
      - 25601:25565
    stop_grace_period: 30s
    environment:
      EULA: "TRUE"
      TYPE: AUTO_CURSEFORGE
      CF_PAGE_URL: https://www.curseforge.com/minecraft/modpacks/minecraft-eternal
      CF_API_KEY: <removed>
      #      CURSEFORGE_FILES: chunky-pregenerator-forge
      MEMORY: 10240M
      #      MODS: https://www.curseforge.com/minecraft/mc-mods/chunky-pregenerator-forge/download/7323694
      MOTD: Powered by McAwesome
      TZ: America/Chicago
      NETWORK_COMPRESSION_THRESHOLD: "-1"
      UID: "568"
      GID: "568"
      RCON_CMDS_STARTUP: |-
        chunky world world
        chunky radius 50000
        chunky start
        chunky world world_nether
        chunky radius 50000
        chunky start
        chunky world world_the_end
        chunky radius 50000
        chunky start
      RCON_CMDS_FIRST_CONNECT: chunky pause
      RCON_CMDS_LAST_DISCONNECT: |-
        chunky world world
        chunky start
        chunky world world_nether
        chunky start
        chunky world world_the_end
        chunky start
    volumes:
      - /mnt/vol1/container_states/minecraft/1/data:/data
      - /mnt/vol1/container_states/minecraft/1/config:/config
networks: {}

[itzg]

Your comment gave me some hints. This is an old mod, and looks like it's using game version 1.12.2, but the Chunky Pregen mod does not list a version with the same game version. Is this why it is not auto-downloading?

To clarify, it's the modpack that is establishing the game version at 1.12.2. Then the CURSEFORGE_FILES automation is trying to resolve chunky using that version, but as you also found it is only supported down to 1.16.5