How do I solve? This is my code: import UIKit class ViewController: UIViewController {   var flipCount = 0 {     didSet {       flipCountLabel.text = "Flips: \(flipCount)"     }   }           @IBOutlet weak var flipCountLabel: UILabel!     // in this area appears the Thread 1: breakpoint 1.1 2.1 (in the line of "flipCount += 1")   @IBAction func touchCard( sender: UIButton) {     flipCount += 1     flipCard(withEmoji: "👻", on: sender)   }           @IBAction func touchSecondCard( sender: UIButton) {     flipCount += 1     flipCard(withEmoji: "🎃", on: sender)   }       func flipCard(withEmoji emoji: String, on button: UIButton) {     if button.currentTitle == emoji {       button.setTitle("", for: UIControl.State.normal)       button.backgroundColor = colorLiteral(red: 1, green: 0.5763723254, blue: 0, alpha: 1)     } else {       button.setTitle(emoji, for: UIControl.State.normal)       button.backgroundColor = colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)     }   } }