title: Flutter Lost connection to device
body: <p>I use Iphone 11 emulator. I hit run button and got this:</p>
  <pre><code>Launching lib/main.dart on iPhone 11 in debug mode...
  Running pod install...
  Running Xcode build...
  Xcode build done.                                           37.0s
  Waiting for iPhone 11 to report its views...
  Debug service listening on ws://127.0.0.1:65405/L1H3N-Q0JFU=/ws
  Syncing files to device iPhone 11...
  Lost connection to device.
  </code></pre>
  <p>It opens the app and shut down immediately.
  I performed <code>flutter clean</code> but it's not working.
  This is my <code>flutter doctor</code>&quot;:</p>
  <pre><code>[✓] Flutter (Channel master, 1.24.0-2.0.pre.98, on Mac OS X 10.15.4 19E287 darwin-x64, locale en-GB)
  [!] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
      ✗ Android license status unknown.
        Run `flutter doctor --android-licenses` to accept the SDK licenses.
        See https://flutter.dev/docs/get-started/install/macos#android-setup for more details.
  [✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
  [✓] Android Studio (version 4.0)
  [✓] VS Code (version 1.49.3)
  [✓] Connected device (1 available)
  </code></pre>