Bukkit

What steps will reproduce the problem?
1. Right clicking the sign
2. -
3. -

What is the expected output? What do you see instead?
To be able to rent the room.

What version of the product are you using?
2.9

Do you have an error log of what happened?
From remote console:

[SEVERE] Could not pass event PlayerInteractEvent to ResidenceSigns v2.9
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
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.v1_4_6.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:178)
at net.minecraft.server.v1_4_6.PlayerInteractManager.interact(PlayerInteractManager.java:376)
at net.minecraft.server.v1_4_6.PlayerConnection.a(PlayerConnection.java:656)
at net.minecraft.server.v1_4_6.Packet15Place.handle(SourceFile:58)
at net.minecraft.server.v1_4_6.NetworkManager.b(NetworkManager.java:290)
at net.minecraft.server.v1_4_6.PlayerConnection.d(PlayerConnection.java:112)
at net.minecraft.server.v1_4_6.ServerConnection.b(SourceFile:39)
at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:30)
at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:585)
at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:481)
at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:416)
at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
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:601)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
... 16 more

Please provide any additional information below.
I had not set ANY perms yet. I made the signs and rooms and it was all successful. I deopped my self to test it. I right clicked it did nothing. In my boseconomy account I have millions of dollars and set the room at 200. I entered the command that works to rent residences with the normal residence plugin. it worked. The room was rented and became unavailable i then right click the sign again and it made it available again. I opped myself and tried again. nothing.