EmberJs: 404 GET http://localhost:4200/assets/my-app.css

I will preface this by saying I am very new to using Ember (1 week) and JS frameworks in general but have been developing .Net WebAPIs and building by own JS front ends for a few years.

I've looked everywhere and can't seem to find any clues on how to debug this issue. I recently integrated Semantic-UI into my app and was able to use it fine for a little while. However, this morning my application started throwing a 404 when trying to access the bundled stylesheet.

I've tried reverting to previous versions and I've even run ember init neither of which resolved the issue.

Currently, I am trying to just create a new app, but am facing issues on that front as well...

$ ember version
version: 1.13.8
node: 0.12.7
npm: 2.13.4
os: win32 x64

bower.json:

"dependencies": {
    "ember": "1.13.7",
    "ember-cli-shims": "ember-cli/ember-cli-shims#0.0.3",
    "ember-cli-test-loader": "ember-cli-test-loader#0.1.3",
    "ember-data": "1.13.8",
    "ember-load-initializers": "ember-cli/ember-load-initializers#0.1.5",
    "ember-qunit": "0.4.9",
    "ember-qunit-notifications": "0.0.7",
    "ember-resolver": "~0.1.18",
    "jquery": "^1.11.3",
    "loader.js": "ember-cli/loader.js#3.2.1",
    "qunit": "~1.18.0",
    "semantic-ui": "~2.0.8"
  }