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I successfully send messages from iPhone to Watch but I cannot send message from Watch to iPhone. I get the following 7018 error from WCSession.default.sendMessage's error property. There is no question on the Internet with the code. I think this will be related with the latest SDKs. _onqueue_notifyOfMessageError:messageID:withErrorHandler:] (null) errorHandler: YES with WCErrorDomain:7018The ouput has also said that iOS app not installed but it also installed beacuse I successfully sending messages from iOS to Watch App.2019-10-02 15:44:47.598081+0300 WatchAppExample WatchKit Extension[19189:300753] [WC] WCSession iOS app not installed2019-10-02 15:44:47.598570+0300 WatchAppExample WatchKit Extension[19189:300753] [WC] -[WCSession _onqueue_notifyOfMessageError:messageID:withErrorHandler:] (null) errorHandler: YES with WCErrorDomain:7018Here's how I send message from Watch to iPhone.@IBAction func sendiPhoneButtonClicked() { if WCSession.default.isReachable { let message = ["message": "Test"] WCSession.default.sendMessage(message, replyHandler: nil, errorHandler: { (err) in debugPrint(err) }) } }Here's how I send message from iPhone to Watch@IBAction func sendWatchButtonClicked(_ sender: UIButton) { if WCSession.default.isReachable { let message = ["message": textField.text] WCSession.default.sendMessage(message, replyHandler: nil, errorHandler: nil) } }Both of ViewController and InterfaceController delegation functions has set.ViewController.swift... override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. if WCSession.isSupported() { WCSession.default.delegate = self WCSession.default.activate() } } ... extension ViewController: WCSessionDelegate { func session(_ session: WCSession, didReceiveMessage message: [String : Any]) { let labelText = message["message"] as? String debugPrint(labelText) label.text = labelText } func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) { debugPrint(error) } func sessionDidBecomeInactive(_ session: WCSession) { } func sessionDidDeactivate(_ session: WCSession) { } }InterfaceController.swift... override func awake(withContext context: Any?) { super.awake(withContext: context) // Configure interface objects here. if WCSession.isSupported() { WCSession.default.delegate = self WCSession.default.activate() } } ... extension InterfaceController: WCSessionDelegate { func session(_ session: WCSession, didReceiveMessage message: [String : Any]) { let labelString = message["message"] as? String debugPrint(labelString) label.setText(labelString) } func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) { } }iOS deployment target: 13.0WatchApp deployment target: 6.0Swift 5Run on iPhone 8 and 11 Pro Max simulators with Apple Watch Series 5 - 40mm