title: Expo not loading (React-Native) -- null Expo SDK version
body: <p>My app was working till today but now it looks like something happened to version 18 of Expo.<br>
  I got this error:</p>
  
  <blockquote>
    <p>The experience you requested uses Expo SDK v(null), but this copy of
    Expo Client requires at least v20.0.0. The author should update their
    experience to a newer Expo SDK version.</p>
  </blockquote>
  
  <p>I then:</p>
  
  <ul>
  <li>Updated to Expo v20.0.0 </li>
  <li>Handled all unmet dependencies </li>
  <li><code>yarn cache clean</code></li>
  <li><code>rm -rf node_modules/</code></li>
  <li>Reinstalled local node modules</li>
  </ul>
  
  <p>and I'm still getting the same error.  </p>
  
  <p>What do I need to do to get Simulator to recognize that I am using the correct version of Expo?</p>
  
  <p><strong>Current environment:</strong></p>
  
  <ul>
  <li>Expo v20.0.0</li>
  <li>react-native v0.47.0</li>
  <li>Node v8.11.1</li>
  <li>Xcode v9.3</li>
  <li>Mac OS v10.13.4</li>
  </ul>