Console errors

[13:53:44 ERROR]: [WorldEdit] Could not dispatch event: com.sk89q.worldedit.even
t.platform.CommandEvent@6253e3f8 to handler EventHandler{priority=NORMAL}
java.lang.reflect.InvocationTargetException
at com.sk89q.worldedit.util.eventbus.EventHandler.handleEvent(EventHandl
er.java:75) ~[worldedit-bukkit-6.0.jar:?]
at com.sk89q.worldedit.util.eventbus.EventBus.dispatch(EventBus.java:187
) [worldedit-bukkit-6.0.jar:?]
at com.sk89q.worldedit.util.eventbus.EventBus.post(EventBus.java:173) [w
orldedit-bukkit-6.0.jar:?]
at com.sk89q.worldedit.bukkit.WorldEditPlugin.onCommand(WorldEditPlugin.
java:242) [worldedit-bukkit-6.0.jar:?]
at com.sk89q.bukkit.util.DynamicPluginCommand.execute(DynamicPluginComma
nd.java:50) [RankupOnKills.jar:?]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:18
0) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3040jnks]
at org.bukkit.craftbukkit.v1_7_R2.CraftServer.dispatchCommand(CraftServe
r.java:696) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3040jnks]
at org.bukkit.craftbukkit.v1_7_R2.CraftServer.dispatchServerCommand(Craf
tServer.java:683) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3040jnks]
at net.minecraft.server.v1_7_R2.DedicatedServer.ax(DedicatedServer.java:
286) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3040jnks]
at net.minecraft.server.v1_7_R2.DedicatedServer.v(DedicatedServer.java:2
51) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3040jnks]
at net.minecraft.server.v1_7_R2.MinecraftServer.u(MinecraftServer.java:5
48) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3040jnks]
at net.minecraft.server.v1_7_R2.MinecraftServer.run(MinecraftServer.java
:459) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3040jnks]
at net.minecraft.server.v1_7_R2.ThreadServerApplication.run(SourceFile:6
18) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-14-g8f8716c-b3040jnks]
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
_07]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
_07]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.7.0_07]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_07]
at com.sk89q.worldedit.util.eventbus.MethodEventHandler.dispatch(MethodE
ventHandler.java:58) ~[worldedit-bukkit-6.0.jar:?]
at com.sk89q.worldedit.util.eventbus.EventHandler.handleEvent(EventHandl
er.java:73) ~[worldedit-bukkit-6.0.jar:?]
... 12 more
Caused by: java.lang.NoSuchMethodError: com.sk89q.minecraft.util.commands.Comman
dContext.split(Ljava/lang/String;)[Ljava/lang/String;
at com.sk89q.worldedit.util.command.SimpleDispatcher.call(SimpleDispatch
er.java:111) ~[worldedit-bukkit-6.0.jar:?]
at com.sk89q.worldedit.extension.platform.CommandManager.handleCommand(C
ommandManager.java:225) ~[worldedit-bukkit-6.0.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
_07]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
_07]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.7.0_07]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_07]
at com.sk89q.worldedit.util.eventbus.MethodEventHandler.dispatch(MethodE
ventHandler.java:58) ~[worldedit-bukkit-6.0.jar:?]
at com.sk89q.worldedit.util.eventbus.EventHandler.handleEvent(EventHandl
er.java:73) ~[worldedit-bukkit-6.0.jar:?]
... 12 more