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Hello, I am having an issue in my app. I cannot continue running the timer when I go to the background. I got the message Can't end BackgroundTask: no background task exists with identifier 1 (0x1), or it may have already been ended. Break in UIApplicationEndBackgroundTaskError() to debug. I already signed the capabilities for Background but I cannot figure out how to solve this.Here is my code: var timer = Timer() var teas = Teas() var isTimerRunning = false var alarmSound = AVAudioPlayer() var playing = false var initialValueOfTime = 0 var teaMinutesLabel = "" private let notificationPublisher = NotificationPublisher() override func viewDidLoad() { super.viewDidLoad() overrideUserInterfaceStyle = .light initialValueOfTime = teas.time runTimer() timeFormatted( } //RunTimer() @objc func runTimer() { if isTimerRunning { teas.time -= 1 if teas.time <= 0 { timer.invalidate() let url = Bundle.main.url(forResource: "AlarmSound1", withExtension: "wav") alarmSound = try! AVAudioPlayer(contentsOf: url!) alarmSound.play() if alarmSound.isPlaying { startButton.setTitle("Done", for: .normal) playing = true } } } else { teas.time = initialValueOfTime } }