Postal Plugin Help

Hi Guys, I have the plugin postal and i am trying to set up my local post office and when i run the command /setlocal i get this
15:00:26 [INFO] chris012696 issued server command: /setlocal threldom
15:00:26 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'setl
ocal' in plugin va_postal v2965_146_plus
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:18
9)
at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchCommand(CraftServe
r.java:523)
at net.minecraft.server.v1_5_R3.PlayerConnection.handleCommand(PlayerCon
nection.java:965)
at net.minecraft.server.v1_5_R3.PlayerConnection.chat(PlayerConnection.j
ava:883)
at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java
:840)
at net.minecraft.server.v1_5_R3.Packet3Chat.handle(Packet3Chat.java:44)
at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292
)
at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java
:109)
at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:3
0)
at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:5
81)
at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:2
26)
at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:4
77)
at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java
:410)
at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:5
73)
Caused by: java.lang.NoClassDefFoundError: com/palmergames/bukkit/towny/exceptio
ns/NotRegisteredException
at com.vodhanel.minecraft.va_postal.commands.Cmdexecutor.setlocal(Cmdexe
cutor.java:1150)
at com.vodhanel.minecraft.va_postal.commands.Cmdexecutor.onCommand(Cmdex
ecutor.java:143)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
... 15 more
Caused by: java.lang.ClassNotFoundException: com.palmergames.bukkit.towny.except
ions.NotRegisteredException
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader
.java:80)
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:53)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 18 more
Can Someone Please Help me!