Bow Spleef: can't enable arena

Hi,

I've a problem with arena. I can't enable it by typing /bs set <arena> enabled. It doesn't work.
Plugin: http://dev.bukkit.org/bukkit-plugins/bow-spleef/

 

Fixed: http://dev.bukkit.org/bukkit-plugins/bow-spleef/

 

I said. I can't enable arena. No errors in console.

 

@ref