Bukkit

What steps will reproduce the problem?
1.
2.
3.

What is the expected output? What do you see instead?
Output: An internal error occurred while attempting to perform this command
I want a hub

What version of the product are you using?
v.1.1

Do you have an error log of what happened?
An internal error occurred while attempting to perform this command

Please provide any additional information below.

I like to skip 1 slot... so, X  X  X  -  -  X  -   -   -

X = Item
- = empty slot..

but i dun no how i do it, i just add slot name, but it didn't work..