Direct answer

Find the first plugin/dependency frame around the `NoSuchMethodError`. Then install a plugin build compatible with your current server API and dependency versions, or update the required dependency as the plugin author documents. Reinstalling the same incompatible JAR or adding RAM will not add the missing method.

What it means

`NoSuchMethodError` means code tried to call a method that is not present in the runtime version of a class it actually loaded.

If you are a player

  • Record the exact command/message or feature that failed and the time it happened.
  • If the problem affects only your account, note your permissions/group and whether another player can use the same feature.
  • Send the owner the exact wording rather than repeatedly retrying; plugin startup/configuration errors must usually be fixed server-side.

If you run the server

  1. Read the full stack trace, including the exact class and method signature.
  2. Update the affected plugin and its dependency/library together from official sources.
  3. Check whether you recently updated the server while leaving an old packet/API plugin behind.
  4. If the error appears only with two plugins together, isolate the conflict on a test copy.

References

Use the documentation for the exact software and release you run. These sources support the settings or diagnostic behavior used in this fix.

Focused diagnostic check: Record the class and method signature from the first NoSuchMethodError. This normally signals API binary incompatibility between builds (server API, dependency or plugin), not a typo in a YAML setting. Update or roll back the mismatched pair together in a test server rather than changing random configuration keys.

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