title: Ionic cordova plugin suddenly not installed
body: <p>Suddenly when building and running my Ionic 3 app from Xcode I get an error like this, for all cordova plugins:</p>
  
  <pre><code>WARN: Native: tried calling StatusBar.styleDefault, but the StatusBar plugin is not installed.
  WARN: Install the StatusBar plugin: 'ionic plugin add cordova-plugin-statusbar'
  </code></pre>
  
  <p>It was working fine so far, I don't understand why this is happening now and how to remedy (except re-installing).</p>
  
  <p>Even though they are well listed in both package.json and config.xml.</p>