Mob Arena Boss Abilities Invalid, Mobs Dropping?

i got the mobarena plugin and set it up fine, but whenever i start my server it says no boss abilities found (despite me putting them in config file) and extracts defaults and says that they are invalid. what should i do? it wont let the boss have abilities. i am guessing it has something to do with the empty folder in the config that is anmed abilities, what do i put in it? a

and whenver i kill mobs, they drop things as if in real world, what should i do?