Cannot make it work with ember version starting 2.6.0

[serv]

I am currently getting this error when I try to ember server

$ npm start

> webclient-cli@3.19.16 start /Users/jasonkim/work/node/webclient-cli
> ember server

DEPRECATION: Overriding init without calling this._super is deprecated. Please call `this._super.init && this._super.init.apply(this, arguments);` addon: `ember-cli-raw-handlebars`
    at Function.Addon.lookup (/Users/jasonkim/work/node/webclient-cli/node_modules/ember-cli/lib/models/addon.js:1005:27)
Could not start watchman
Visit https://ember-cli.com/user-guide/#watchman for more info.
Cannot read property 'ui' of undefined
TypeError: Cannot read property 'ui' of undefined
    at warn (/Users/jasonkim/work/node/webclient-cli/node_modules/ember-cli/lib/models/addon.js:40:11)
    at Class.mergeTrees (/Users/jasonkim/work/node/webclient-cli/node_modules/ember-cli/lib/models/addon.js:53:5)
    at Class.treeForApp (/Users/jasonkim/work/node/webclient-cli/node_modules/ember-cli-raw-handlebars/index.js:32:17)
    at Class._treeFor (/Users/jasonkim/work/node/webclient-cli/node_modules/ember-cli/lib/models/addon.js:371:33)
    at Class.treeFor (/Users/jasonkim/work/node/webclient-cli/node_modules/ember-cli/lib/models/addon.js:339:21)
    at /Users/jasonkim/work/node/webclient-cli/node_modules/ember-cli/lib/broccoli/ember-app.js:499:20
    at Array.map (native)
    at EmberApp.addonTreesFor (/Users/jasonkim/work/node/webclient-cli/node_modules/ember-cli/lib/broccoli/ember-app.js:497:30)
    at EmberApp._processedAppTree (/Users/jasonkim/work/node/webclient-cli/node_modules/ember-cli/lib/broccoli/ember-app.js:795:25)
    at EmberApp.appAndDependencies (/Users/jasonkim/work/node/webclient-cli/node_modules/ember-cli/lib/broccoli/ember-app.js:1080:10)