TypeError: Path must be a string. Received null

I'm getting the following error when doing ember deploy production

TypeError: Path must be a string. Received null
    at assertPath (path.js:7:11)
    at join (path.js:1211:7)
    at fetchSha (/Users/Adtechmedia/Projects/drugsearch/node_modules/ember-pagefront/node_modules/ember-cli-deploy-pagefront/lib/fetch-commit.js:26:22)
    at module.exports (/Users/Adtechmedia/Projects/drugsearch/node_modules/ember-pagefront/node_modules/ember-cli-deploy-pagefront/lib/fetch-commit.js:48:10)
    at Class._uploadIndex (/Users/Adtechmedia/Projects/drugsearch/node_modules/ember-pagefront/node_modules/ember-cli-deploy-pagefront/index.js:124:22)
    at tryCatch (/Users/Adtechmedia/Projects/drugsearch/node_modules/ember-cli/node_modules/rsvp/dist/rsvp.js:538:12)
    at invokeCallback (/Users/Adtechmedia/Projects/drugsearch/node_modules/ember-cli/node_modules/rsvp/dist/rsvp.js:553:13)
    at publish (/Users/Adtechmedia/Projects/drugsearch/node_modules/ember-cli/node_modules/rsvp/dist/rsvp.js:521:7)
    at flush (/Users/Adtechmedia/Projects/drugsearch/node_modules/ember-cli/node_modules/rsvp/dist/rsvp.js:2373:5)
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
Pipeline aborted

here are my package.json dependencies

  "devDependencies": {
    "broccoli-asset-rev": "^2.4.5",
    "ember-ajax": "^2.4.1",
    "ember-bootstrap": "0.11.1",
    "ember-cli": "2.9.1",
    "ember-cli-app-version": "^2.0.0",
    "ember-cli-babel": "5.1.10",
    "ember-cli-dependency-checker": "^1.3.0",
    "ember-cli-deploy": "1.0.0-beta.1",
    "ember-cli-htmlbars": "^1.0.10",
    "ember-cli-htmlbars-inline-precompile": "^0.3.3",
    "ember-cli-icheck": "0.0.7",
    "ember-cli-inject-live-reload": "^1.4.1",
    "ember-cli-jshint": "^1.0.4",
    "ember-cli-moment-shim": "2.2.1",
    "ember-cli-qunit": "^3.0.1",
    "ember-cli-release": "^0.2.9",
    "ember-cli-sass": "5.6.0",
    "ember-cli-sri": "^2.1.0",
    "ember-cli-test-loader": "^1.1.0",
    "ember-cli-uglify": "^1.2.0",
    "ember-component-css": "0.2.1",
    "ember-data": "^2.9.0",
    "ember-export-application-global": "^1.0.5",
    "ember-font-awesome": "2.2.0",
    "ember-load-initializers": "^0.5.1",
    "ember-moment": "6.1.0",
    "ember-pagefront": "0.11.2",
    "ember-pikaday": "2.2.0",
    "ember-power-select": "1.0.0-beta.28",
    "ember-radio-button": "1.0.7",
    "ember-resolver": "^2.0.3",
    "ember-responsive": "2.0.0",
    "ember-transition-helper": "0.0.6",
    "ember-truth-helpers": "1.2.0",
    "ember-welcome-page": "^1.0.3",
    "loader.js": "^4.0.10"
  }

and my bower.json dependencies

  "dependencies": {
    "ember": "~2.9.0",
    "ember-cli-shims": "0.1.3",
    "bootstrap": "~3.3.5",
    "bootstrap-sass": "^3.3.7",
    "font-awesome": "~4.5.0",
    "iCheck": "^1.0.2"
  }

I'm using node v6.9.1

Any thoughts on this?

pagefront / ember-pagefront

TypeError: Path must be a string. Received null #20