Change image of a button when clicking it Xcode

I am trying to change the the image of a button when i click it and I'm using the method below:

    @IBOutlet weak var firstCard1: UIButton!
    @IBAction func firstCard(_ sender: UIButton) {
    let blueCard = UIImage(named: "blue_back")
    firstCard1.setImage(blueCard, for: .normal)

I get an error on line 4 on the

for: .normal

It says "Editor placeholder in Soucer file."

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