Wow lua macro tbc

[tunin]

Im trying to get some basic lua macro to work on tbc servers but it doesnt seem to work...
For example this one:
/run if not UnitBuff("player","Battle Shout") and not UnitAffectingCombat("player") then CastSpellByName("Battle Shout") end

or even this one:
/run if GetShapeshiftForm()==1 and UnitPower("player") >= 10 and not UnitDebuff("target", "Rend") then CastSpellByName("Rend") end

But i could get to work this one:
/run if IsUsableSpell("Charge", "target") == 1 and IsSpellInRange("Charge", "target") == 1 then CastSpellByName("Charge") end

The problem seems to be at the command UnitDebuff and UnitBuff...

Did at tbc time the lua macro was different somehow?
Please someone explain this to me...

[Augury13]

Some of the functions might be blocked by that servers api.