title: Error at new SubprocessError in ionic cordova build ios
body: <p>I'm going to build ios platform on Mac and I have this problem.</p>
  
  <p>I use macOS 10.12, Xcode 8 and Ionic 4. I've tried <code>"ionic cordova platform rm ios"</code> and <code>"ionic cordova platform add ios"</code> and build but it's still not working.</p>
  
  <blockquote>
    <p>Daos-Mac:Ionic_UI_V1 daovu$ ionic cordova build ios</p>
  </blockquote>
  
  <pre><code>ng run app:ionic-cordova-build --platform=ios
  </code></pre>
  
  <blockquote>
    <p>Error at new SubprocessError (/usr/local/lib/node_modules/ionic/node_modules/@ionic/utils-subprocess/dist/index.js:40:23) ...</p>
  </blockquote>