Fails for me pretty early on:

ng set defaults.styleExt scss

Could not start watchman; falling back to NodeWatcher for file system events. Visit http://ember-cli.com/user-guide/#watchman for more info. Cannot read property 'serialize' of undefined TypeError: Cannot read property 'serialize' of undefined

I installed watchman and received the same error

Looks like this has been reported elsewhere: https://github.com/angular/angular-cli/issues/1905