title: Could not start watchman; falling back to NodeWatcher for file system events
body: <p>I get the below error message while I switch between my ember applications: 
  version: 2.4.2
  Could not start watchman; falling back to NodeWatcher for file system events.
  Visit ember-cli.com for more info.
  Livereload server on <a href="http://localhost:49153" rel="nofollow">http://localhost:49153</a>
  Could not serve on <a href="http://localhost:4200" rel="nofollow">http://localhost:4200</a>. It is either in use or you do not have permission.</p>
  
  <p>Here are the packages that I have setup on my machine:
  npm --version
  2.14.20
  bower --version
  1.7.7
  ember --version 
  2.4.2
  node: 4.4.0
  os: linux x64</p>