Supermacro not working correctly?

[Argionelite]

It's kind of weird, when I use the Isshiftkeydown thing, it doesn't work if i try to use Arcane Missiles.

Here's the macro:

/run local x = IsShiftKeyDown(); if x == nil then cast("Fire Blast(Rank 5)") else cast("Arcane Missiles(Rank 5)") end

Every time i shift use it, nothing happens. No notifications, no sign of the button being pressed, nothing.

[LYQ]

IsShiftKeyDown() will probably only return true or false, x == nil maybe not possible

/run if IsShiftKeyDown() then CastSpellByName("Arcane Missiles(Rank 5)") else CastSpellByName("Fire Blast(Rank 5)") end

check if the spells are spelled correctly
"Fire Blast(Rank 5)" and "Fire Blast (Rank 5)" are not the same