Could not start watchman; falling back to NodeWatcher for file system events

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 http://localhost:49153 Could not serve on http://localhost:4200. It is either in use or you do not have permission.

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