Okay, so I have PS configured so that everything is turned off, for my server all I wanted was City Protection which I've set to be lapis blocks cause that's a little easier to obtain. And it works great. But when people place down the blocks we get this error in console. (http://pastebin.com/fEDJW00d) It's not inconveniencing players or the server in anyway that I can see. Just thought I'd let you know.

Server specs:
http://pastebin.com/8RLnCYE9