Ember-cli: Live reload not working

The error is essentially caused by FSEvents watching too many files. If you're using Sublime Text, try excluding node_modules/, tmp/, and dist/ from your project (add them to the folder_exclude_patterns array in your Sublime user preferences).

If you're not using Sublime, or if doing so doesn't fix the issue, try upgrading your version of Node and version of ember-cli to the latest versions, as well as installing watchman using brew install watchman if you have Homebrew installed/are on OS X (as the latest versions of ember-cli no longer rely on FSEvents.

Source: https://github.com/ember-cli/ember-cli/issues/1260#issuecomment-67549158