Bukkit

What is the expected output? What do you see instead?
None error :)

What version of the product are you using?
0.8.7

Do you have an error log of what happened?
http://pastie.org/8263653

Please provide any additional information below.
Hi,
This error keep comming in the console. It recently caused my server to crash. Any idea why?

Thanks for helping!

It's because, you used a decimal number "0.30" for your cooldown option in your script. you should use an Integer. Like this: 10, or this: 2.

if you want a cooldown shorter than one minute, You should use the delay option.

Ok, thanks :)