How to test or troubleshoot? Ionic framework on node.js (with Angular.js)

Im new to mobile development and trying to follow step by step on a app.

Page is blank on server startup with a arrow and the word "back" when there's supposed to be a full app.

Any idea how to test or where I can observe the error from? Many thanks!

Update:

This is what I see in developer tools (Console)

• Failed to load resource: the server responded with a status of 404 (Not Found)

  local@cordova.js

• Failed to load resource: the server responded with a status of 404 (Not Found)

  local@js/services.js

• Uncaught SyntaxError: Unexpected token . controllers.js:171

• Uncaught Error [$injector:modulerr] Failed to instantiate module bucketList due to: Error: [$injector:modulerr]

• Failed to instantiate module bucketList.controllers due to: Error: [$injector:nomod] Module 'bucketList.controllers' is not available ......1)

Additionally, running Testem with Jasmine gave the following additional error:

• Angular is not defined in line 1 of app.js, which is the following code:

  angular.module('bucketList', ['ionic', 'firebase', 'bucketList.controllers'])

Its something to do with dependencies as mentioned here: https://docs.angularjs.org/guide/di

But Im unable to pick out the erroneous relations...

Update 2: controllers.js:171 refers to the first line of this block line

   .controller('newCtrl', function($rootScope, $scope, $window, $firebase) {
  $scope.data = {
    item: ""
  };

  $scope.close = function() {
    $scope.modal.hide();
  };

  $scope.createNew = function() {
    var item = this.data.item;

    if (!item) return;

    $scope.modal.hide();
    $rootScope.show();
    $rootScope.show("Please wait... Creating new");

    var form = {
      item: item,
      isCompleted: false,
      created: Date.now(),
      updated: Date.now()
    };

    var bucketListRef = new Firebase($rootScope.baseUrl + escapeEmailAddress($rootScope.userEmail));
    $firebase(bucketListRef).$add(form);
    $rootScope.hide();
  };
})

..of which this is the view file html.

 <div class="modal slide-in-up" ng-controller="newCtrl">
  <header class="bar bar-header bar-secondary">
    <button class="button button-clear button-primary" ng-click="close()">Cancel</button>
    <h1 class="title">New Item</h1>
    <button class="button button-positive" ng-click="createNew()">Done</button>
  </header>

  <ion-content class="padding has-header">
    <input type="text" placeholder="I need to do..." ng-model="data.item">
  </ion-content>
</div>