Bukkit

What steps will reproduce the problem?
1.Start a server with multiworld.
2.Create a region in a new world on the server, not the default one.
3.A region is created and it works just fine
4.Restart the server.
5.Get the error "Failed to load region : blablabla. Could not read location(s) and/or world.

What is the expected output? What do you see instead?
the region disappear after server restart

What version of the product are you using?
latest 5.0.01

Do you have an error log of what happened?
Failed to load region : blablabla. Could not read location(s) and/or world.

Please provide any additional information below.
There is only 3 files in the world configurations folder. world, world_neather, world_the_end
My other worlds doesn't show up. Duplicating a rwc file and changing its name and the first line doesn't work.

If anyone reads this, mutliworld issues are usually caused by Regios loading before your multiworld plugin. As a temporary work around, you can add:

softdepend: [yourmultiworldpluginname]

to Regios' plugin.yml and your problems should clear up.