title: Type 'Promise<void>' is not assignable to type 'Marker'. Property '_objectInstance' is missing in type 'Promise<void>'. Ionic 2
body: <p>I tried to apply what is in the docs gor the google maps in ionic 2 as it is in the official site: <a href="https://ionicframework.com/docs/native/google-maps/" rel="noreferrer">Ionic Docs Google Maps</a></p>
  
  <p>I got this error: </p>
  
  <pre><code>Type 'Promise&lt;void&gt;' is not assignable to type 'Marker'. Property '_objectInstance' is missing in type 'Promise&lt;void&gt;'. Ionic 2
  </code></pre>
  
  <p>as it is figured in the screenshot below:
  <a href="https://i.stack.imgur.com/Xyh12.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Xyh12.png" alt="enter image description here"></a></p>