Bukkit

What steps will reproduce the problem?
1.
2.
3.

What is the expected output? What do you see instead?
For the plugin to be enabled. It says in game when i type /sg help it says "You typed the command incorrectly, type /sg help for help"

What version of the product are you using?
1.0.5

Do you have an error log of what happened?

15.03 18:29:02 [Server] INFO at net.shockverse.survivalgames.SurvivalGames.onEnable(SurvivalGames.java:68) ~[?:?]
15.03 18:29:02 [Server] INFO at net.shockverse.survivalgames.core.Settings.load(Settings.java:81) ~[?:?]
15.03 18:29:02 [Server] INFO at net.shockverse.survivalgames.core.Settings.setup(Settings.java:144) ~[?:?]
15.03 18:29:02 [Server] INFO at net.shockverse.survivalgames.extras.PropertyList.setString(PropertyList.java:121) ~[?:?]
15.03 18:29:02 [Server] INFO at net.shockverse.survivalgames.extras.PropertyList.setString(PropertyList.java:126) ~[?:?]
15.03 18:29:02 [Server] INFO java.lang.NoClassDefFoundError: org/apache/commons/lang3/tuple/Pair
15.03 18:29:02 [Server] INFO [18:29:02 ERROR]: Error occurred while enabling SurvivalGames v1.0.5 (Is it up to date?)
15.03 18:29:02 [Server] INFO [18:29:02 INFO]: [SurvivalGames] Enabling SurvivalGames v1.0.5

Please provide any additional information below.
Idk what it is but im guessing that its not updated.