Information

• Server version: 1.12.2

• Full output of /mv version -b: https://pastebin.com/dsM4ry4T

• Server log: https://gist.github.com/TerThesz/345106ec358c32e4fd5d3e01dbefc27d

Details

I was able to reproduce my issue on a freshly setup and up-to-date server with the latest version of Multiverse plugins with no other plugins and with no kinds of other server or client mods.

Description
An error shows up in the console after every right-click

Steps to reproduce
1- Download latest version of Multiverse-Core from https://www.spigotmc.org/ to a 1.12.2 spigot server
2- Try right-clicking on anything

Expected behavior
An error should pop out in console

Screenshots
Non

The latest version of MV is not compatible with 1.12, nor does it claim to be. For 1.12.x, you will need to use an older version of Multiverse for it to work. Multiverse 2.5.0 should work: https://dev.bukkit.org/projects/multiverse-core/files/2428161