Tool tips in killer's item.

Hi. This is problably a noob question but i cant seem to get the tooltips working in my server.
I need to be able to mouse-hoover the weapon name in the message "...was slain by..." and it should show me the enchants on the weapon. I've seen this on many server's but i cant get i working on mine. Did i turned it off somehow?

here my info:
Craftbukkit v =

1.7.2-R0.3​

Plugin list:
/home/minecraft/plugins/WorldGuard.jar
/home/minecraft/plugins/WorldEdit.jar
/home/minecraft/plugins/WorldBorder.jar
/home/minecraft/plugins/Vault.jar
/home/minecraft/plugins/VariableTriggers-1.2.7.jar
/home/minecraft/plugins/SignURLs-1.0.5.jar
/home/minecraft/plugins/SignEditor.jar
/home/minecraft/plugins/ServerSigns.jar
/home/minecraft/plugins/PlayerVaults.jar
/home/minecraft/plugins/PerWorldPlugins.jar
/home/minecraft/plugins/OpenInv.jar
/home/minecraft/plugins/ObsidianDestroyer.jar
/home/minecraft/plugins/NoCheatPlus.jar
/home/minecraft/plugins/Multiverse-Core-2.4.jar
/home/minecraft/plugins/MCore.jar
/home/minecraft/plugins/mcMMO.jar
/home/minecraft/plugins/InfiniteDispensersAndDroppers.jar
/home/minecraft/plugins/HeroChat.jar
/home/minecraft/plugins/HealthBar.jar
/home/minecraft/plugins/HeadConomy.jar
/home/minecraft/plugins/FrameProtect_v2.5.jar
/home/minecraft/plugins/Factions.jar
/home/minecraft/plugins/EssentialsSpawn.jar
/home/minecraft/plugins/EssentialsProtect.jar
/home/minecraft/plugins/EssentialsGroupManager.jar
/home/minecraft/plugins/EssentialsChat.jar
/home/minecraft/plugins/EssentialsAntiBuild.jar
/home/minecraft/plugins/Essentials.jar
/home/minecraft/plugins/EnjinMinecraftPlugin.jar
/home/minecraft/plugins/EnderPearlCooldown.jar
/home/minecraft/plugins/CreeperHeal.jar
/home/minecraft/plugins/CombatLog.jar
/home/minecraft/plugins/cncp.jar
/home/minecraft/plugins/Clearlag.jar
/home/minecraft/plugins/ChestCommands.jar
/home/minecraft/plugins/BattleArena.jar
/home/minecraft/plugins/AutoMessage.jar
/home/minecraft/plugins/ArenaSpleef.jar
/home/minecraft/plugins/Anti-Enchant.jar

 

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