title: Ionic 4: loading.present is not a function
body: <p>Ionic 4, getting an error while using the loader
  <code>loading.present is not a function</code></p>
  
  <p>Here is my code:</p>
  
  <pre><code>const loading =  this.loadingController.create({
    message: 'Loading',
  });
  
  loading.present();
  </code></pre>