Scripts don't work more

[Deathmaker1]

Excuse me if I open another topic but I got an unexpainable problem:I maked the scripts of all Naxxramas but I have a strange problem with Maexxna and Gothik.In my server the Ids resets all Sundays,before the last reset they worked perfectly,Sunday morning I start a new Id and this bosses don't work more,Maexxna doesn't do the Wep Spray and Gothik in Phase 2 doesn't do Shadow Bolts and Harvest Souls.
Here's the part of the scripts about this spells:
Maexxna->function Web_Spray(Unit,event)
Unit:CastSpell(29484)
end
Gothik->
function Return(Unit,event)
Unit:SendChatMessage(14,0,"I have waited long enough!Now,you face the harvester of souls!")
Unit:MoveTo(2699.75,-3335.20,267.68,0.00)
Unit:SetCombatCapable(0)
end
PS:Logically I didn't modify nothing in this scripts first the resetxD
PS:The server gives me the error:Attempt to call a nil value in the console when I engage this bosses.