Scripts

There's a problem: here's the code:

function portal(hero)
if GetObjectOwner(hero) == 1 then
if GetObjectiveState("tom") == OBJECTIVE_UNKNOWN then
MessageBox(path.."tom1.txt")
end
if GetObjectiveState("tom") == OBJECTIVE_ACTIVE then
QuestionBox(path.."tom2.txt",'Dragon("'..hero..'")')
end
end
end

Trigger(OBJECT_TOUCH_TRIGGER, "portal","portal")

function Dragon(hero)
local week = ceil(GetDate(DAY) / 7)
sleep(3)
--
StartCombat(hero,nil,3,84, diff * week, 84, diff * week, 84, diff * week,nil,'BattleResult',nil,nil)
end

Everything works fine, but... (see the screenshot) What could be causing this? I just want the console to be clean and not display an error.