Errror when doing //set 0

[lemonsked]

:[17:03:40 INFO]: WorldEdit: Niba11 (in "flatlands"): /set 0 - Region: (-14.0, 50.0, 87.0) - (-3.0, 70.0, 88.0)
:[17:03:40 ERROR]: [WorldEdit] An unexpected error while handling a WorldEdit commandjava.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor404.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sk89q.worldedit.util.command.parametric.BindingHelper.bind(BindingHelper.java:167)
at com.sk89q.worldedit.util.command.parametric.ParametricCallable.call(ParametricCallable.java:220)
at com.sk89q.worldedit.util.command.SimpleDispatcher.call(SimpleDispatcher.java:125)
at com.sk89q.worldedit.extension.platform.CommandManager.handleCommand(CommandManager.java:225)
at sun.reflect.GeneratedMethodAccessor397.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sk89q.worldedit.util.eventbus.MethodEventHandler.dispatch(MethodEventHandler.java:58)
at com.sk89q.worldedit.util.eventbus.EventHandler.handleEvent(EventHandler.java:73)
at com.sk89q.worldedit.util.eventbus.EventBus.dispatch(EventBus.java:187)
at com.sk89q.worldedit.util.eventbus.EventBus.post(EventBus.java:173)
at com.sk89q.worldedit.bukkit.WorldEditPlugin.onCommand(WorldEditPlugin.java:242)
at com.sk89q.bukkit.util.DynamicPluginCommand.execute(DynamicPluginCommand.java:54)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141)
at org.bukkit.craftbukkit.v1_8_R2.CraftServer.dispatchCommand(CraftServer.java:646)
at net.minecraft.server.v1_8_R2.PlayerConnection.handleCommand(PlayerConnection.java:1139)
at net.minecraft.server.v1_8_R2.PlayerConnection.a(PlayerConnection.java:974)
at net.minecraft.server.v1_8_R2.PacketPlayInChat.a(PacketPlayInChat.java:45)
at net.minecraft.server.v1_8_R2.PacketPlayInChat.a(PacketPlayInChat.java:1)
at net.minecraft.server.v1_8_R2.PlayerConnectionUtils$1.run(SourceFile:13)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at net.minecraft.server.v1_8_R2.SystemUtils.a(SourceFile:60)
at net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:712)
at net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:368)
at net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:651)
at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:554)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: 0
at java.lang.String.charAt(String.java:658)
at com.sk89q.util.StringUtil.lookup(StringUtil.java:290)
at com.sk89q.worldedit.blocks.BlockType.lookup(BlockType.java:323)
at com.sk89q.worldedit.blocks.BlockType.lookup(BlockType.java:308)
at com.sk89q.worldedit.extension.factory.DefaultBlockParser.parseFromInput(DefaultBlockParser.java:129)
at com.sk89q.worldedit.extension.factory.DefaultBlockParser.parseFromInput(DefaultBlockParser.java:48)
at com.sk89q.worldedit.internal.registry.AbstractFactory.parseFromInput(AbstractFactory.java:57)
at com.sk89q.worldedit.extension.factory.RandomPatternParser.parseFromInput(RandomPatternParser.java:59)
at com.sk89q.worldedit.extension.factory.RandomPatternParser.parseFromInput(RandomPatternParser.java:31)
at com.sk89q.worldedit.internal.registry.AbstractFactory.parseFromInput(AbstractFactory.java:57)
at com.sk89q.worldedit.internal.command.WorldEditBinding.getPattern(WorldEditBinding.java:213)
... 31 more