https://pastebin.com/XeQ1V6nE
-- Console error when i reload

My items.yml --
https://pastebin.com/4gtcM6fX

Known bug in 4.5, update to the latest version v5.0.3 you are quite a few versions behind.

https://www.spigotmc.org/resources/itemjoin.12661/download?version=262715

Supports MC 1.7-1.12.2

Wow Thanks, that was quick!

Will it overide my current items?

To my knowledge no, it's been quite a while since that version. However your config and enlang files will reset. Any files that do reset will be saved with numbers on the end and you can simply fill out the new fields in the newly generated files.

ok thanks

Let me know if something did not work properly, I will close this for now but please re-open this issue if something goes wrong or the issue is not resolved.