Mo Arrows Bug (Teraku)

2012-03-27 22:59:47 [SEVERE] Could not pass event EntityDamageByEntityEvent to MoArrows
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:303)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:459)
	at org.bukkit.craftbukkit.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:363)
	at org.bukkit.craftbukkit.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:378)
	at net.minecraft.server.EntityLiving.damageEntity(EntityLiving.java:608)
	at net.minecraft.server.EntityAnimal.damageEntity(SourceFile:124)
	at net.minecraft.server.EntityArrow.F_(EntityArrow.java:215)
	at net.minecraft.server.World.entityJoinedWorld(World.java:1265)
	at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:106)
	at net.minecraft.server.World.playerJoinedWorld(World.java:1247)
	at net.minecraft.server.World.tickEntities(World.java:1154)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:545)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:452)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:490)
Caused by: java.lang.NoClassDefFoundError: com/palmergames/bukkit/towny/object/TownyUniverse
	at com.gmail.l0g1clvl.MoArrows.TownyHook.canShootTowny(TownyHook.java:35)
	at com.gmail.l0g1clvl.MoArrows.MoArrowsEntityListener.onEntityDamage(MoArrowsEntityListener.java:226)
	at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301)
	... 14 more