What does a mod's dependencies question mean — what does mod X need?

"Missing dependency" is one of the most common modded crash messages. It simply means a mod needs another mod to run — here's what that means and how to fix it.

What a dependency is

Many mods require a library/dependency mod to function — for example, Fabric API for Fabric mods, or a specific core lib for Forge mods. Without it, the mod can't load.

Fixing a missing dependency

1. Read the crash message — it names what's missing (e.g. "missing dependency" or "requires X").
2. Find that dependency on the mod's CurseForge/Modrinth page (it lists required dependencies).
3. Download the correct version for your loader and MC version.
4. Upload it into the mods folder (via the Mods & Plugins page, Files, or SFTP).
5. Restart and confirm it loads.

Tip: The mod's CurseForge/Modrinth page always lists its required dependencies — check it before installing to avoid a boot crash.

Frequently asked questions

What does "requires X" mean at boot? Mod X is a dependency your installed mod needs — install X (correct version) into the mods folder.

Where do I find what a mod needs? On the mod's CurseForge or Modrinth page, which lists required dependencies.