Use the code from the master branch, or join the discord if you don't know how to compile source.

It was, here. The NoSuchMethodError is caught:
6d47120

Other users are not having an issue with this using the code from the master branch. If you have a different problem join the discord to get support.

You are not using Spigot, instead you are using Core bukkit. Please update to Spigot and the plugin will work fine.