AddEvent - Error

[mateuszal3]

Welcome. I have problem... On load TFS 0.2 Tibia 8.1.

function travel(cid, steps)
	if steps > 7 then
		doTeleportThing(cid, GetCreatureDestinationPos(cid))
		doCreatureSay(cid, "HYPER SPACE !!", TALKTYPE_ORANGE_2)
	else
		doTeleportThing(cid, {x=getCreaturePosition(cid).x,y=getCreaturePosition(cid).y-1,z=getCreaturePosition(cid).z})
		steps = steps + 1
		addEvent(travel ,100 , cid , steps)
	end
end

function onStepIn(cid, item, pos)
	position = GetCreatureDestinationPos(cid)
	if (position.x == 0) then
		doTeleportThing(cid, {x=95, y=117, z=7}) 
	else 
		addEvent(travel, 1, cid, 0)
	end
end

In console i've get error:
[29/04/2012 16:28:57] Lua Script Error: [MoveEvents Interface]
[29/04/2012 16:28:57] data/movements/scripts/hyper.luanStepIn

[29/04/2012 16:28:57] luaAddEvent(). callback parameter should be a function.

Please help me.. and sorry for my English :/