Mod Not Loading

Your own mods: why one does not show up or stops the game, and how to fix it.

Mods
  1. Right version and loader. It must be built for Forge 1.8.9. Fabric mods and mods for newer versions do not load on 1.8.9.
  2. Switched on? On the Profiles page, check its switch. A mod you turned off stays in the folder but is not loaded.
  3. Needs another mod? Some Forge mods need a library mod. Check the mod's own page.
  4. Two copies? Two versions of the same mod in one profile will clash. Remove the older one.
  5. Does Sour already do it? Mods that change the same thing as a Sour mod (another keystrokes, another zoom, OldAnimations) can fight it. Use one or the other.
  6. Rescan. If you copied the jar into the folder by hand, press the refresh button on the profile's mod list.