Hi, my issue is that i have my world with multiverse which is the standard "world", "world_nether", and "world_the_end" and then i created two creative superflat worlds for youtuber tutorial friends ...

I have installed the latest version of Multiverse Core found on the Bukkit Page and I can't use it. ** org.bukkit.command.CommandException: Cannot execute command 'mv' in plugin Multiverse-Core v4.1.0 ...