IllegalArgumentException

[ChargedCreeper]

:[15:59:00 INFO]: WorldEdit: money (in "flatlands"): /fill stone 50 - Position: (44.0, 469.0, 355.0)
:[15:59:00 WARN]: java.lang.IllegalArgumentException: minY <= maxY required
:[15:59:00 WARN]: at com.google.common.base.Preconditions.checkArgument(Preconditions.java:88)
:[15:59:00 WARN]: at com.sk89q.worldedit.function.mask.BoundedHeightMask.(BoundedHeightMask.java:42)
:[15:59:00 WARN]: at com.sk89q.worldedit.EditSession.fillXZ(EditSession.java:706)
:[15:59:00 WARN]: at com.sk89q.worldedit.command.UtilityCommands.fill(UtilityCommands.java:75)
:[15:59:00 WARN]: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
:[15:59:00 WARN]: at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
:[15:59:00 WARN]: at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
:[15:59:00 WARN]: at java.lang.reflect.Method.invoke(Method.java:606)
:[15:59:00 WARN]: at com.sk89q.minecraft.util.commands.CommandsManager.invokeMethod(CommandsManager.java:533)
:[15:59:00 WARN]: at com.sk89q.worldedit.extension.platform.CommandManager$CommandsManagerImpl.invokeMethod(CommandManager.java:342)
:[15:59:00 WARN]: at com.sk89q.worldedit.extension.platform.CommandManager$CommandsManagerImpl.invokeMethod(CommandManager.java:263)
:[15:59:00 WARN]: at com.sk89q.minecraft.util.commands.CommandsManager.executeMethod(CommandsManager.java:520)
:[15:59:00 WARN]: at com.sk89q.minecraft.util.commands.CommandsManager.execute(CommandsManager.java:425)
:[15:59:00 WARN]: at com.sk89q.worldedit.extension.platform.CommandManager.handleCommand(CommandManager.java:177)
:[15:59:00 WARN]: at sun.reflect.GeneratedMethodAccessor48.invoke(Unknown Source)
:[15:59:00 WARN]: at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
:[15:59:00 WARN]: at java.lang.reflect.Method.invoke(Method.java:606)
:[15:59:00 WARN]: at com.sk89q.worldedit.util.eventbus.MethodEventHandler.dispatch(MethodEventHandler.java:58)
:[15:59:00 WARN]: at com.sk89q.worldedit.util.eventbus.EventHandler.handleEvent(EventHandler.java:73)
:[15:59:00 WARN]: at com.sk89q.worldedit.util.eventbus.EventBus.dispatch(EventBus.java:186)
:[15:59:00 WARN]: at com.sk89q.worldedit.util.eventbus.EventBus.post(EventBus.java:172)
:[15:59:00 WARN]: at com.sk89q.worldedit.WorldEdit.handleCommand(WorldEdit.java:879)
:[15:59:00 WARN]: at com.sk89q.worldedit.bukkit.WorldEditPlugin.onCommand(WorldEditPlugin.java:236)
:[15:59:00 WARN]: at com.sk89q.bukkit.util.DynamicPluginCommand.execute(DynamicPluginCommand.java:52)
:[15:59:00 WARN]: at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:181)
:[15:59:00 WARN]: at org.bukkit.craftbukkit.v1_7_R4.CraftServer.dispatchCommand(CraftServer.java:767)
:[15:59:00 WARN]: at net.minecraft.server.v1_7_R4.PlayerConnection.handleCommand(PlayerConnection.java:1043)
:[15:59:00 WARN]: at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:880)
:[15:59:00 WARN]: at net.minecraft.server.v1_7_R4.PacketPlayInChat.a(PacketPlayInChat.java:28)
:[15:59:00 WARN]: at net.minecraft.server.v1_7_R4.PacketPlayInChat.handle(PacketPlayInChat.java:65)
:[15:59:00 WARN]: at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:186)
:[15:59:00 WARN]: at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81)
:[15:59:00 WARN]: at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734)
:[15:59:00 WARN]: at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289)
:[15:59:00 WARN]: at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584)
:[15:59:00 WARN]: at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490)
:[15:59:00 WARN]: at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628)