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Outdated Bukkit Version

A plugin refuses to run because your server software is older than it supports. The plugin needs a newer Bukkit/Spigot/Paper version than you are running.

What does this error mean?
'Unsupported server version' means the plugin was built for a newer server API and will not load on your older build. Either update the server, or use a plugin build that supports your version. 
Unsupported server version
Most Common Causes
  • Server software older than the plugin requires.
  • A plugin auto-updated to a build needing a newer server.
  • Running a legacy server with modern plugins.
  • Mixing very different plugin/server generations.
  • Not updating the server after upgrading plugins.
How To Diagnose
  1. Run '/version' to confirm your server build.
  2. Check the plugin's minimum supported version.
  3. Compare the two to see the gap.
  4. Look for a plugin build matching your version.
Recommended Fixes
  • Update the server
    Upgrade to a server build the plugin supports (back up first).
  • Use a matching plugin build
    Install an older plugin version that supports your server, if available.
  • Plan upgrades together
    Update server and plugins in step to avoid version gaps.
  • Replace abandoned plugins
    Swap unmaintained plugins for ones that track current versions.
Analyze My Log
Frequently Asked Questions

Run '/version' in the console for the exact server build.

Updating the server is usually best for security and compatibility, but back up first.

Some plugins/configs may need updates too, test on a copy before going live.