Mod Rejection

The Aternos forums are now deprecated

Learn more about this change here.

For help regarding Aternos, we recommend you to visit our support center.

  • I tried creating an Aternos server for the Technic Launcher Modpack called Blightfall. For the most part, it was working fine until I tried to join the server but it instead just says "Mod rejections [FMLMod:coretweaks{0.3.0.3}". So I had tried going onto the Modpacks files and onto the Mod file of the mod pack and deleted the mod out of the file that matches the name but it still says the same thing even though I had deleted the mod from the Modpack.

  • You cannot possibly have removed a mod from the modpack on your Aternos server. On your client maybe, but this'll still fail because it needs to match on both your client and version.


    Ensure that you have the same modpack version on your client as on your server. If you do, contact the modpack author for support.