title: Android Studio error "Installation failed due to: 'Connection refused: connect'"
body: <p>I am trying to install the app but Android Studio showing error:</p>
  <pre><code>Launching 'app' on Xiaomi Redmi 4A.
  Installation did not succeed.
  The application could not be installed.
  ...
  Installation failed due to: 'Connection refused: connect'
  </code></pre>
  <p>How do I fix this error?</p>