Bukkit

What steps will reproduce the problem?
1. Load plugin, get this error: http://pastebin.com/NqvjKXY5
2.Wait for announcement to say, join hunt.
3.Do /joinhunt, it tells you: This world doesn't have a hunt.
http://pastebin.com/P5BF8MvP

What is the expected output? What do you see instead?
Let you join the hunt.

What version of the product are you using?
4.20

Do you have an error log of what happened?
http://pastebin.com/NqvjKXY5

Please provide any additional information below.
Teleport to every world, says the same thing in every world.