Checking item amount

Sorry, I couldn't find anything previously posted on the matter. Anyway, really quick:

I make an item quest like so.


What I'm going for: The event checks if you have 5 potions. If you have 5 potions, it'll take them and reward you, etc. If not, blah. So anyway...

What I get:

The only possible offender of this crash must be "$PokemonBag.pbQuantity(:POTION)==5," as it's the only script in the entire event.

This is the script copied directly from the "Manipulation items" tutorial:
$PokemonBag.pbQuantity(:POTION)==5
As compared to mine:
$PokemonBag.pbQuantity(:POTION)==5

So am I missing a step or something? The tutorial (here) mentions something about comparing the script with "$PokemonBag.pbQuantity(:POTION)," but I'm not exactly sure what it means by "compare" and how I'd go about "comparing" the two scripts. Thank you. Almost done with this demo, dangit :)

Make sure it's in a conditional branch and try adding "PBItems::POTION" instead.

The ability to use just :POTION there rather than PBItems::POTION was added in Essentials v14. If you're using an older version of Essentials like a fool, bear in mind that many things will be different.