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Plugin Placed in Mods Folder

A Bukkit/Paper plugin was dropped into a Forge/Fabric server's mods folder, and the loader rejected it. Plugins and mods are different things and live in different folders.

O que significa este erro?
The mod loader expects mods, not plugins. Finding a plugin.yml inside a jar in the mods folder tells it the file is a Bukkit plugin, not a mod, so it flags an invalid mod file. Plugins belong in plugins/ on a Bukkit-based server, not in mods/. 
Invalid Mod File: plugin.yml found
Causas mais comuns
  • A plugin jar placed in the mods folder of a modded server.
  • Confusing plugins with mods.
  • Trying to run plugins on pure Forge/Fabric (which has no plugins/ folder).
  • Mixing plugin and mod files in one folder.
  • Following a guide for the wrong server type.
Como diagnosticar
  1. Confirm the jar contains a plugin.yml (it is a plugin).
  2. Check what server software you run (Forge/Fabric vs Paper).
  3. Note that pure modded servers have no plugins/ folder.
  4. Identify any other misplaced files.
Correções recomendadas
  • Remove the plugin from mods
    Take the plugin jar out of the mods folder, it cannot load there.
  • Use a hybrid server for both
    To run mods and plugins together, use a hybrid like Mohist/Arclight (with caveats).
  • Pick the right platform
    Use Paper for plugins, or Forge/Fabric for mods, based on what you need.
  • Separate file types
    Keep mods in mods/ and plugins in plugins/ (only on platforms that support both).
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Perguntas frequentes

Not directly. Pure Forge/Fabric loads mods only. Plugins need a Bukkit-based or hybrid server.

Plugins use the Bukkit API (server-side), mods use Forge/Fabric and can change the game on both sides.

Use a hybrid server (Mohist/Arclight), accepting that hybrids can be less stable.