title: "$ flutter build web" is throwing the error "Missing index.html"?
body: <p>When I run: </p>
  
  <pre><code>$ flutter build web 
  </code></pre>
  
  <p>I'm getting the error </p>
  
  <pre><code>Missing index.html.
  </code></pre>
  
  <p>The flutter app is displaying in the browser, but in VS Code it reads "No Device." How can I debug, or fix this problem?</p>