Bukkit

What steps will reproduce the problem?
1. Start server (1.7.5)
2. Get error
3. Get random bugs when playing build my thing

What is the expected output? What do you see instead?
Working plugin !
I get buggy plugin :\

What version of the product are you using?
2.0

Do you have an error log of what happened?
http://pastebin.com/S6yMgV5b

Please provide any additional information below.
I hope this error will be fixes soon, I get random bugs like - lobby getting unset, sometimes it kicks all players with error - too large packet or something like that, sometimes players are able to chat when building, sometimes it doesnt clear the arena, etc...