title: how to resolve the zone already loaded error in angular4?
body: <p>Im trying to load my angular build from a typescript package using (dist/index.html). Its loading fine, but when im going back and again trying to load the same, its showing the below errors.</p>
  
  <p>VM5485:1 Uncaught Error: Zone already loaded.
      at new d (:1:211206)</p>
  
  <p>VM5457:1 Uncaught Error: Zone.js has detected that ZoneAwarePromise <code>(window|global).Promise</code> has been overwritten.</p>
  
  <p>I tried:
  removing the zone.js from polyfills.ts and adding "angularfire2": "5.0.0-rc.4".</p>
  
  <p>But no luck. Can someone please help</p>