Unsupported API version - SpillereNO/BetterStacking GitHub Wiki

To fix InvalidPluginException: Unsupported API version, please do following...

1. Make sure your server is offline.
2. Open plugin jar in 7zip or WinRar, and edit plugin.yml:
3. Change api-version from 1.16 to 1.13, 1.14 or 1.15.
4. Save changes and start your server.