11:19:23 [INFO] [Multiverse-Core] PLEASE IGNORE the 'Plugin X does not contain any generators' message below!
11:19:23 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'mv' in plugin Multiverse-Core v2.4-b527
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:189)
	at org.bukkit.craftbukkit.v1_6_R2.CraftServer.dispatchCommand(CraftServer.java:523)
	at net.minecraft.server.v1_6_R2.PlayerConnection.handleCommand(PlayerConnection.java:964)
	at net.minecraft.server.v1_6_R2.PlayerConnection.chat(PlayerConnection.java:882)
	at net.minecraft.server.v1_6_R2.PlayerConnection.a(PlayerConnection.java:839)
	at net.minecraft.server.v1_6_R2.Packet3Chat.handle(SourceFile:49)
	at net.minecraft.server.v1_6_R2.NetworkManager.b(NetworkManager.java:296)
	at net.minecraft.server.v1_6_R2.PlayerConnection.e(PlayerConnection.java:118)
	at net.minecraft.server.v1_6_R2.ServerConnection.b(SourceFile:37)
	at net.minecraft.server.v1_6_R2.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:590)
	at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:226)
	at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:486)
	at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:419)
	at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
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:476)
	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(ClassLoader.java:306)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
	... 22 more
[/spoiler]