Running React Native Android on device
<p>I followed this <a href="https://facebook.github.io/react-native/docs/running-on-device-android.html" rel="noreferrer">official help page</a> and also consulted this <a href="https://stackoverflow.com/questions/35147204/running-react-native-projects-present-at-github-on-android-devices">previous SO question</a>.</p>

<p>But I still don't know what is wrong here.  </p>

<p><a href="https://i.stack.imgur.com/BICV4.png" rel="noreferrer"><img src="https://i.stack.imgur.com/BICV4.png" alt="enter image description here"></a></p>

<p>Let's take step by step:</p>

<ol>
<li><p><strong>Ensure the package server is running.</strong> From the screenshot, you can see the command I typed "react-native run-android" and the reponse "Starting JS server..."</p></li>
<li><p><strong>Ensure your device is connected...</strong> Yes, Vysor sees my device.  Wee see Vysor showing the app running in the screenshot.</p></li>
<li><p>...<strong>USB enabled</strong> Yes, the app is running, that's why we see the red error screen, but it's the app running nevertheless.</p></li>
<li><p><strong>Run "adb reverse tcp:8081 tcp:8081"</strong> Yes, the screenshot shows that I ran the command.</p></li>
<li><p><strong>Device and port...</strong> Yes, did that too.  See next screenshot</p></li>
</ol>

<p><a href="https://i.stack.imgur.com/FiovX.png" rel="noreferrer"><img src="https://i.stack.imgur.com/FiovX.png" alt="enter image description here"></a>  </p>

<p>What am I still doing wrong?  How can I make it work?</p>