Trying to add Flan's mod to mods list but it doesn't work

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've checked the criteria to suggest mods but in spite of it being on forge and the download not redirecting.

    But I keep getting the "This can't be added for technical reasons." Can someone take a look at this and see if I'm missing anything here?

    The technical reason is probably because you can't upload weapon packs to an Aternos server, rendering the mod practically useless.

    mods are weird, hard to work with, and will have conflicts

    - bukkit gang