Bukkit

What steps will reproduce the problem?
1.create a clone on a 1.6.4 Server

What is the expected output? What do you see instead?

What version of the product are you using?
1.6.2

Do you have an error log of what happened?

Please provide any additional information below.
The clone showed up,but it just stand there doing nothing,and i can't delete it,when i create it,it says internal server error have occurred.