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iOS Enumerations and Optionals in Swift Introduction to Enumerations Enum Methods

I am on the enums challenge involving UIBarButtons and I am getting an error, be sure to assign the result to doneButton

Can someone tell me why the "Recheck work" button tells me to "Make sure you have assigned the result to a constant named doneButton" ? The HTML page is blank and I get no errors in my playground.

buttons.swift
// Example of UIBarButtonItem instance
// let someButton = UIBarButtonItem(title: "A Title", style: .plain, target: nil, action: nil)

enum BarButton {
    case done(title: String)
    case edit(title: String)

    func button() -> UIBarButtonItem {
      switch self {
        case .done(let title):
          return UIBarButtonItem(title: title, style: .done, target: nil, action: nil)
        case .edit(let title):
          return UIBarButtonItem(title: title, style: .plain, target: nil, action: nil)
      }
    }
}

let doneButton = BarButton.done(title: "Save").button()