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iOS Object-Oriented Swift Complex Data Structures Custom Initializers

Works in Xcode playground but not in the exercise, why?

Why Bummer?

struct RGBColor {
  let red: Double
  let green: Double
  let blue: Double
  let alpha: Double

  let description: String

  // Add your code below
      init(r: Double, g: Double, b: Double, alf: Double) {
        self.red = r
        self.green = g
        self.blue = b
        self.alpha = alf
        self.description = "red: \(self.red), green: \(self.green), blue: \(self.blue), alpha: \(self.alpha)"