Try this:
TeleportPlayersToSaidaEventId= 0
function onUse(cid, item, frompos, item2, topos)
TelportPlayersToSaidaEventId = addEvent(teleportPlayersToSaida, 10*1000, getPlayersInArea(config.nortEsquerdaSalaBoss, config.sulDireitaSalaBoss))
end
function onStepIn(cid, item, frompos, item2...