2013-11-21 20:28:06 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'mv' in plugin Multiverse-Core v2.5-b641
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:192)
	at org.bukkit.craftbukkit.v1_6_R3.CraftServer.dispatchCommand(CraftServer.java:528)
	at net.minecraft.server.v1_6_R3.PlayerConnection.handleCommand(PlayerConnection.java:968)
	at net.minecraft.server.v1_6_R3.PlayerConnection.chat(PlayerConnection.java:886)
	at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:837)
	at net.minecraft.server.v1_6_R3.Packet3Chat.handle(SourceFile:49)
	at net.minecraft.server.v1_6_R3.NetworkManager.b(NetworkManager.java:296)
	at net.minecraft.server.v1_6_R3.PlayerConnection.e(PlayerConnection.java:116)
	at net.minecraft.server.v1_6_R3.ServerConnection.b(SourceFile:37)
	at net.minecraft.server.v1_6_R3.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:592)
	at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:227)
	at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:488)
	at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:421)
	at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/v1_5_R3/World
	at uk.co.jacekk.bukkit.skylandsplus.SkylandsPlus.getDefaultWorldGenerator(SkylandsPlus.java:32)
	at com.onarandombox.MultiverseCore.commands.GeneratorCommand.runCommand(GeneratorCommand.java:44)
	at com.pneumaticraft.commandhandler.multiverse.CommandHandler.checkAndRunCommand(CommandHandler.java:279)
	at com.pneumaticraft.commandhandler.multiverse.CommandHandler.processFoundCommands(CommandHandler.java:143)
	at com.pneumaticraft.commandhandler.multiverse.CommandHandler.locateAndRunCommand(CommandHandler.java:93)
	at com.onarandombox.MultiverseCore.MultiverseCore.onCommand(MultiverseCore.java:882)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
	... 15 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_5_R3.World
	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)
	... 22 more