Flutter Building for iOS with Firebase device token error

 To solve it add following to AppDelegate

 override func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {

   Messaging.messaging().apnsToken = deviceToken

   print("X__APNS: \(String(describing: deviceToken))")

   super.application(application, didRegisterForRemoteNotificationsWithDeviceToken: deviceToken)

 }