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HelloI began learning about WatchKit. But I can't go to next step at sendMessage()https://medium.com/@litoarias/watchos-5-part-2-communication-between-iphone-and-apple-watch-and-vice-versa-ced41f453b11I created new iOS App with Watch App Project in XCode 11.2 to follow the post.At Part2, I found the problem. sendMessage() in WatchApp occured below error.[Error Logs in Watch App] - send message to iOS from WatchOS2019-11-06 16:38:05.378991+0900 watchapp WatchKit Extension[66565:2566272] [WC] WCSession iOS app not installed2019-11-06 16:38:05.379949+0900 watchapp WatchKit Extension[66565:2566272] [WC] -[WCSession _onqueue_notifyOfMessageError:messageID:withErrorHandler:] (null) errorHandler: YES with WCErrorDomain:7018Sending data has been failed. error[Error Domain=WCErrorDomain Code=7018 "Companion app is not installed." UserInfo={NSLocalizedRecoverySuggestion=Install the Companion app., NSLocalizedDescription=Companion app is not installed.}]2019-11-06 16:38:05.381395+0900 watchapp WatchKit Extension[66565:2579690] [WC] WCSession iOS app not installed2019-11-06 16:38:05.381644+0900 watchapp WatchKit Extension[66565:2579690] [WC] -[WCSession _onqueue_notifyOfMessageError:messageID:withErrorHandler:] (null) errorHandler: YES with WCErrorDomain:7018Sending data has been failed. error[Error Domain=WCErrorDomain Code=7018 "Companion app is not installed." UserInfo={NSLocalizedRecoverySuggestion=Install the Companion app., NSLocalizedDescription=Companion app is not installed.}][Log for Printing Received Data in Watch App From iOS App][session(_:didReceiveMessage:replyHandler:)] Watch Receive. message[["title": gogo]] handler[(Function)]Ofcourse, I checked my iPhone Simulator and Watch Simulator their are paired together.And calling sendMessage() in iPhone App is very well(iOS => Watch => iOS).Please anyone let me know, what I missed. Thanks.