title: An error occurred when I was running "ionic cordova platform add ios"
body: <p>An error occurred when I was running <code>ionic cordova platform add ios</code>.It noticed me with the information </p>
  
  <blockquote>
    <p>[ERROR] Cordova encountered an error.
            You may get more insight by running the Cordova command above directly.</p>
    
    <p>[ERROR] An error occurred while running cordova platform add ios
    --save (exit code 1):</p>
  </blockquote>
  
  <pre><code>    Using cordova-fetch for cordova-ios@^4.4.0
      Adding zone.js project...
      Error: Your zone.js platform does not have Api.js”
  </code></pre>
  
  <p>I had tried to update the version of ionic / cordova and also reinstalled node.js and npm.But It still no worked.</p>
  
  <p>Who can tell me how to resolve this problem。Thank you.</p>