Bukkit

What steps will reproduce the problem?
1.place [rent] sign
2. someone right-clicks on sign
3.

What is the expected output? What do you see instead?
What I see is...
2012-12-09 14:48:54 [SEVERE] Could not pass event PlayerInteractEvent to ResidenceSigns v2.9
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:341)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
    at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:177)
    at net.minecraft.server.ItemInWorldManager.interact(ItemInWorldManager.java:376)
    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:662)
    at net.minecraft.server.Packet15Place.handle(SourceFile:58)
    at net.minecraft.server.NetworkManager.b(NetworkManager.java:290)
    at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:113)
    at net.minecraft.server.ServerConnection.b(SourceFile:39)
    at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:595)
    at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
Caused by: java.lang.NoClassDefFoundError: net/milkbowl/vault/permission/Permission
    at brandenBoegh.ResidenceSigns.ResidenceSignsListener.onSignPunch(ResidenceSignsListener.java:374)
    at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:339)
    ... 16 more

What version of the product are you using?
In the log it says ResidenceSignsVersion: 2.9
craftbukkit-1.4.5-R0.2

Do you have an error log of what happened?
yes (pasted above)

Please provide any additional information below.