Restart ember-cli too often than usual

I have to restart ember-cli too often, every couple of files I edited, it would report some sort of error related to a file under the tmp folder. I am sure there is nothing wrong because everything is ok after a restart.

ember serve

I didn't install "watchman" so I just used nodewatch. Is it because of this?

Anyways, any suggestion would be appreciated.

ember -v
version 2.2.0-beta.3
node 4.2.3
npm 2.14.10
Ember 2.2.0
Ember data 2.3.1
jQuery 2.1.4