title: Angular 4 animation giving error as "no exported member '?DomAnimationEngine'"
body: <p>I need to work on Angular 4 animation so i followed the usual steps like importing the BrowserAnimationsModule module in the root module and importing it in the component. I have also installed npm modules but I am getting an error as</p>
  
  <pre><code>node_modules/@angular/animations/browser"' has no exported member '?DomAnimationEngine'
  </code></pre>
  
  <p>Please let me know what i need to do to solve it.</p>