EnderBan | Ban easily items and blocks from the EnderChest 1.1

Great plugin! Exactly what I needed. However, I'm getting this error
https://pastebin.com/PCnGBmQG. please fix

I want to create a pvp server, but i want ban some items but i don't know make a plugin.
With this plugin you can easily add banned item and remove banned item
So thank you dude