Problem with function onDeath

[ot flames]

hello, I had made a script that when you kill a demon you loot a key from it with actionID 6000. but it doesn't work, I dunno why??

function onDeath(cid, corpse, killer)
local key = 2089
if corpse == 2916 then 
	doPlayerSendTextMessage(killer, MESSAGE_EVENT_ADVANCE, "Mystic Key is found")	
		doAddContainerItem(uid, key, 1)
		doSetItemActionId(key, 6000)
 
	end
end

I also added the even to the Demon

 <script>
<event name="MysticKey"/>
 </script>

and to creaturescripts.xml

<event type="death" name="MysticKey" script="MYSkey.lua"/>

I don't know where is the problem ???!