00:40:39 [SEVERE] com.sk89q.minecraft.util.commands.WrappedCommandException: java.lang.NoSuchMethodError: org.bukkit.World.spawnCreature(Lorg/bukkit/Location;Lorg/bukkit/entity/CreatureType;)Lorg/bukkit/entity/Creature;
00:40:39 [SEVERE]       at com.sk89q.minecraft.util.commands.CommandsManager.executeMethod(CommandsManager.java:353)
00:40:39 [SEVERE]       at com.sk89q.minecraft.util.commands.CommandsManager.execute(CommandsManager.java:256)
00:40:39 [SEVERE]       at com.sk89q.commandbook.CommandBookPlugin.onCommand(CommandBookPlugin.java:226)
00:40:39 [SEVERE]       at org.bukkit.command.PluginCommand.execute(PluginCommand.java:35)
00:40:39 [SEVERE]       at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:80)
00:40:39 [SEVERE]       at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:254)
00:40:39 [SEVERE]       at net.minecraft.server.NetServerHandler.c(NetServerHandler.java:596)
00:40:39 [SEVERE]       at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:559)
00:40:39 [SEVERE]       at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:553)
00:40:39 [SEVERE]       at net.minecraft.server.Packet3Chat.a(SourceFile:24)
00:40:39 [SEVERE]       at net.minecraft.server.NetworkManager.a(NetworkManager.java:198)
00:40:39 [SEVERE]       at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:72)
00:40:39 [SEVERE]       at net.minecraft.server.NetworkListenThread.a(SourceFile:100)
00:40:39 [SEVERE]       at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:368)
00:40:39 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:283)
00:40:39 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(SourceFile:375)
00:40:39 [SEVERE] Caused by: java.lang.NoSuchMethodError: org.bukkit.World.spawnCreature(Lorg/bukkit/Location;Lorg/bukkit/entity/CreatureType;)Lorg/bukkit/entity/Creature;
00:40:39 [SEVERE]       at com.sk89q.commandbook.commands.FunCommands.spawnMob(FunCommands.java:67)
00:40:39 [SEVERE]       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
00:40:39 [SEVERE]       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
00:40:39 [SEVERE]       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
00:40:39 [SEVERE]       at java.lang.reflect.Method.invoke(Method.java:597)
00:40:39 [SEVERE]       at com.sk89q.minecraft.util.commands.CommandsManager.executeMethod(CommandsManager.java:343)
00:40:39 [SEVERE]       ... 15 more
>