Import broken

[GiuseppeGroth]

2013-01-05 01:03:00 [INFO] Giuseppe1990 issued server command: /mv import skylands normal -g SkylandsPlus
2013-01-05 01:03:00 [INFO] Giuseppe1990: Starting import of world 'skylands'...
2013-01-05 01:03:00 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'mv' in plugin Multiverse-Core v2.5-b637
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
at org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchCommand(CraftServer.java:514)
at net.minecraft.server.v1_4_6.PlayerConnection.handleCommand(PlayerConnection.java:979)
at net.minecraft.server.v1_4_6.PlayerConnection.chat(PlayerConnection.java:897)
at net.minecraft.server.v1_4_6.PlayerConnection.a(PlayerConnection.java:852)
at org.getspout.spout.SpoutPlayerConnection.a(SpoutPlayerConnection.java:121)
at net.minecraft.server.v1_4_6.Packet3Chat.handle(Packet3Chat.java:44)
at net.minecraft.server.v1_4_6.NetworkManager.b(NetworkManager.java:290)
at net.minecraft.server.v1_4_6.PlayerConnection.d(PlayerConnection.java:112)
at org.getspout.spout.SpoutPlayerConnection.d(SpoutPlayerConnection.java:196)
at net.minecraft.server.v1_4_6.ServerConnection.b(SourceFile:39)
at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:30)
at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:598)
at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/World
at uk.co.jacekk.bukkit.SkylandsPlus.SkylandsPlus.getDefaultWorldGenerator(SkylandsPlus.java:32)
at org.bukkit.WorldCreator.getGeneratorForName(WorldCreator.java:284)
at org.bukkit.WorldCreator.generator(WorldCreator.java:181)
at com.onarandombox.MultiverseCore.utils.WorldManager.addWorld(WorldManager.java:200)
at com.onarandombox.MultiverseCore.commands.ImportCommand.runCommand(ImportCommand.java:147)
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:881)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
... 17 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.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:423)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 27 more
2013-01-05 01:03:08 [INFO] /62.75.159.89:39983 lost connection
2013-01-05 01:03:08 [INFO] [BukkitSpeak] ..::LN::.. kinnaj100™:

[betterphp]

Update the plugin.