2013-07-09 12:10:12 [SEVERE] Could not pass event WorldInitEvent to InfinitePlots v0.9-SNAPSHOT
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.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463)
        at org.bukkit.craftbukkit.v1_6_R2.CraftServer.createWorld(CraftServer.java:743)
        at org.bukkit.Bukkit.createWorld(Bukkit.java:226)
        at org.bukkit.WorldCreator.createWorld(WorldCreator.java:235)
        at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:421)
        at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:402)
        at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:377)
        at com.onarandombox.MultiverseCore.utils.WorldManager.loadWorlds(WorldManager.java:676)
        at com.onarandombox.MultiverseCore.MultiverseCore.onEnable(MultiverseCore.java:303)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:382)
        at org.bukkit.craftbukkit.v1_6_R2.CraftServer.loadPlugin(CraftServer.java:286)
        at org.bukkit.craftbukkit.v1_6_R2.CraftServer.enablePlugins(CraftServer.java:268)
        at net.minecraft.server.v1_6_R2.MinecraftServer.l(MinecraftServer.java:319)
        at net.minecraft.server.v1_6_R2.MinecraftServer.f(MinecraftServer.java:296)
        at net.minecraft.server.v1_6_R2.MinecraftServer.a(MinecraftServer.java:256)
        at net.minecraft.server.v1_6_R2.DedicatedServer.init(DedicatedServer.java:164)
        at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:397)
        at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_6_R1/CraftWorld
        at uk.co.jacekk.bukkit.infiniteplots.WorldInitListener.onWorldInit(WorldInitListener.java:30)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.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:425)
        ... 23 more
Caused by: java.lang.ClassNotFoundException: org.bukkit.craftbukkit.v1_6_R1.CraftWorld
        at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:70)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 29 more