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ios - Inappropriate Expected declaration error

Why am I getting an error in this code, it seems perfectly normal to me. I declare 'hills' as a variable but I am still getting the error "Expected declaration" for both 'hills' and 'bg'.

var bg = SKSpriteNode(imageNamed: "sky")
bg.position = CGPointMake(bg.size.width / 2, bg.size.height / 2)


self.addChild(bg)

var hills = SKSpriteNode(imageNamed: "hills")
hills.position = CGPointMake(hills.size.width / 2, 300)

self.addChild(hills)
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I suspect the reason for the Expected Declaration message is that you have placed this code inside of a class without putting it inside of a method. The example below compiles, but it gives the same error you are seeing if it is not included inside of the setup method:

class MyNode: SKSpriteNode {
    func setup() {
        var bg = SKSpriteNode(imageNamed: "sky")
        bg.position = CGPointMake(bg.size.width / 2, bg.size.height / 2)


        self.addChild(bg)

        var hills = SKSpriteNode(imageNamed: "hills")
        hills.position = CGPointMake(hills.size.width / 2, 300)

        self.addChild(hills)
    }
}

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