Issue with Shoplib

[mclevenger75]

So I've added the shoplib to my quest game, but when I try to buy an item, quest returns an error in the buyingprice function. Even simplifying the library to return the obj.price, I get the following error:

Error running script: Error compiling expression 'obj.price': Unknown object or variable 'obj'

Function name: BuyingPrice
return type: integer
parameters: price

if (game.pov.status = "Merchant's Tongue") {
rate = 75
}
else {
rate = 100
}
return (obj.price)

It seems like it's not getting passed a value or something.