i don't know
pls check link: https://pastebin.com/eXeBrkd3
thanks sir

https://pastebin.com/rbZTzBTb

It's an error related to the GUI, please join the discord server and try an alpha.

EDIT:
I'm pretty sure this's the inventory title error that got fixed within the new alphas, so please join the discord server using one of the links on the spigot and GitHub page, there you'll be able to download an alpha version with this bug fix from the #alpha-version channel.
I'm sorry for the issue, if you're still experiencing this after alpha please report it again with the new error, we really appreciate that.

thanks sir!

I'm going to close this issue as it should've been fixed within alpha and we'll probably release a new release soon.