Permissions Node is Invalid?

Every time I refresh the plugins I get this in the console.


[SEVERE] Permission node 'groups' in server config is invalid
java.lang.IllegalArgumentException: 'default' key contained unknown value
at org.bukkit.permissions.Permission.loadPermission(Permission.java:268)
at org.bukkit.permissions.Permission.loadPermission(Permission.java:235)
at org.bukkit.craftbukkit.CraftServer.loadCustomPermissions(CraftServer.java:472)
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:173)
at org.bukkit.craftbukkit.CraftServer.reload(CraftServer.java:430)
at org.bukkit.Bukkit.reload(Bukkit.java:187)
at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:22)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:165)
at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:372)
at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:368)
at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:553)
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:530)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:414)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)

Never worked with permissions before so some help would be greatly appreciated!

Fixed!

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

How?

 

Indeed: How?

I think I have the same problem. And the worst thing of the internet is this:
http://xkcd.com/979/

I tried to follow the steps here:
http://wiki.bukkit.org/Setting_Up_Bukkit_Permissions#Setting_Permissions_in_config.yml

But that seems to give a wrongly formatted file.
I then tried something like this and that did work (this is from memory, so I could be making a mistake):

Code:

server.basic:
    default: true
    permissions:
        plugin.allows: true

EDIT by Moderator: merged posts, please use the edit button instead of double posting.