I can't run my Ember project on OSX El-Capitan ( The Broccoli Plugin: [object Object] )

I'm using Ember.js with the following nodejs and ember-cli versions:

⇒  ember -v
(node:8463) fs: re-evaluating native module sources is not supported. If you are using the graceful-fs module, please update it to a more recent version.
WARNING: WARNING: Node v6.0.0 has currently not been tested against Ember CLI and may result in unexpected behaviour.
ember-cli: 2.5.0
node: 6.0.0
os: darwin x64

But for some reason whenever I try to run the app using ember s I get:

ember s
(node:10672) fs: re-evaluating native module sources is not supported. If you are using the graceful-fs module, please update it to a more recent version.
WARNING: WARNING: Node v6.0.0 has currently not been tested against Ember CLI and may result in unexpected behaviour.
Livereload server on http://localhost:49152
Serving on http://localhost:3100/
The Broccoli Plugin: [object Object] failed with:
Error: Attempting to watch missing directory: /Users/info/code/ember-project/tests
    at EventEmitter.Watcher_addWatchDir [as addWatchDir] (/Users/info/code/ember-project/node_modules/broccoli-sane-watcher/index.js:90:11)
    at /Users/info/code/ember-project/node_modules/ember-cli-broccoli/lib/builder.js:95:35
    at lib$rsvp$$internal$$tryCatch (/Users/info/code/ember-project/node_modules/rsvp/dist/rsvp.js:493:16)
    at lib$rsvp$$internal$$invokeCallback (/Users/info/code/ember-project/node_modules/rsvp/dist/rsvp.js:505:17)
    at /Users/info/code/ember-project/node_modules/rsvp/dist/rsvp.js:1001:13
    at lib$rsvp$asap$$flush (/Users/info/code/ember-project/node_modules/rsvp/dist/rsvp.js:1198:9)
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)

The broccoli plugin was instantiated at:
    at WatchedDir.Directory (/Users/info/code/ember-project/node_modules/broccoli-source/index.js:14:31)
    at new WatchedDir (/Users/info/code/ember-project/node_modules/broccoli-source/index.js:58:13)
    at EmberApp._initOptions (/Users/info/code/ember-project/node_modules/ember-cli/lib/broccoli/ember-app.js:222:16)
    at new EmberApp (/Users/info/code/ember-project/node_modules/ember-cli/lib/broccoli/ember-app.js:93:8)
    at module.exports (/Users/info/code/ember-project/ember-cli-build.js:6:13)
    at Class.module.exports.Task.extend.setupBroccoliBuilder (/Users/info/code/ember-project/node_modules/ember-cli/lib/models/builder.js:55:19)
    at Class.module.exports.Task.extend.init (/Users/info/code/ember-project/node_modules/ember-cli/lib/models/builder.js:89:10)
    at new Class (/Users/info/code/ember-project/node_modules/core-object/core-object.js:18:12)
    at Class.module.exports.Task.extend.run (/Users/info/code/ember-project/node_modules/ember-cli/lib/tasks/serve.js:15:19)
    at /Users/info/code/ember-project/node_modules/ember-cli/lib/commands/serve.js:64:24

I made sure to install npm and bower packages but still having the same issue.

My package.json looks like:

{
  "name": "canopy-fresh",
  "version": "0.0.0",
  "description": "Small description for canopy-fresh goes here",
  "private": true,
  "directories": {
    "doc": "doc",
    "test": "tests"
  },
  "scripts": {
    "build": "ember build",
    "start": "ember server",
    "test": "ember test"
  },
  "repository": "",
  "engines": {
    "node": ">= 0.10.0"
  },
  "author": "",
  "license": "MIT",
  "devDependencies": {
    "broccoli-asset-rev": "^2.4.2",
    "ember-ajax": "0.7.1",
    "ember-cli": "2.5.0",
    "ember-cli-app-version": "^1.0.0",
    "ember-cli-babel": "^5.1.6",
    "ember-cli-dependency-checker": "^1.2.0",
    "ember-cli-htmlbars": "^1.0.3",
    "ember-cli-htmlbars-inline-precompile": "^0.3.1",
    "ember-cli-inject-live-reload": "^1.4.0",
    "ember-cli-jshint": "^1.0.0",
    "ember-cli-pickadate": "1.3.1",
    "ember-cli-qunit": "^1.4.0",
    "ember-cli-release": "0.2.8",
    "ember-cli-sass": "5.3.1",
    "ember-cli-semantic-ui": "0.8.1",
    "ember-cli-sri": "^2.1.0",
    "ember-cli-uglify": "^1.2.0",
    "ember-data": "^2.5.0",
    "ember-export-application-global": "^1.0.5",
    "ember-load-initializers": "^0.5.1",
    "ember-resolver": "^2.0.3",
    "loader.js": "^4.0.1"
  }
}

any idea what is going on?