Argument '<controller>' is not a function in angular routing

Im getting this error and I cannot locate the problem, following is my error

Error: [ng:areq] Argument 'homeCtrl' is not a function, got undefined http://errors.angularjs.org/1.2.25/ng/areq?p0=homeCtrl&p1=not%20aNaNunction%2C%20got%20undefined at VALIDITY_STATE_PROPERTY (http://localhost:8100/lib/ionic/js/ionic.bundle.js:7703:12) at assertArg (http://localhost:8100/lib/ionic/js/ionic.bundle.js:9134:11) at assertArgFn (http://localhost:8100/lib/ionic/js/ionic.bundle.js:9144:3) at $get (http://localhost:8100/lib/ionic/js/ionic.bundle.js:14903:9) at updateView (http://localhost:8100/lib/ionic/js/ionic.bundle.js:42986:30) at IonicModule.directive.directive.compile (http://localhost:8100/lib/ionic/js/ionic.bundle.js:42942:9) at nodeLinkFn (http://localhost:8100/lib/ionic/js/ionic.bundle.js:14336:13) at compositeLinkFn (http://localhost:8100/lib/ionic/js/ionic.bundle.js:13730:13) at nodeLinkFn (http://localhost:8100/lib/ionic/js/ionic.bundle.js:14330:24) at compositeLinkFn (http://localhost:8100/lib/ionic/js/ionic.bundle.js:13730:13)

Following is my angular, ionic project

#app.js
angular.module('ft', ['ionic', 'ft.controllers'])
.run(function($ionicPlatform) {
  // run method
})
.config(function($stateProvider, $urlRouterProvider){
  $stateProvider
  .state('app', {
    url: '/app',
    abstract: true,
    templateUrl: 'templates/sideMenu.html',
    controller: 'menuCtrl'
  })
  .state('app.home', {
    url: '/home',
    views: {
      'menuContent': {
        templateUrl: 'templates/home.html',
        controller: 'homeCtrl'
      }
    }
  });
  $urlRouterProvider.otherwise('/app/home');
});

#www/js/controllers/home_ctrl.js
angular.module('ft.controllers', [])
  .controller('homeCtrl', function($scope, $ionicModal, $timeout){

  });

#index.html file
<script src="js/app.js"></script>
<script src="js/controllers/home_ctrl.js"></script>

But if i remove the homeCtrl from routes, it works fine. I spent fair amount of time now and for me it seems ok.

any help would be much appreciated, thanks in advance

It looks like you are using bundling & minification, try:

var app = angular.module('ft.controllers', []);
app.controller('homeCtrl', ['$scope', '$ionicModal', '$timeout', function ($scope, $ionicModal, $timeout) {
});

Minification of the JS code replaces variables name. AngularJS does it's injection of modules based on this names.

Finally I was able to fix the issue, The problem was ft.controllers is used in two controllers. 

angular.module('ft.controllers', [])
  .controller('homeCtrl', function($scope, $ionicModal, $timeout){
  });

angular.module('ft.controllers', [])
.controller('menuCtrl', function($scope, $ionicModal, $timeout){
]});

When I changed the names to ft.controllers.home, ft.controllers.menu and added them to app.js it started working

How ever I thought it will work as I believe the same this is used in ionic sideMenu started app

#controllers.js from ionic started sideMenu app
angular.module('starter.controllers', [])

.controller('AppCtrl', function($scope, $ionicModal, $timeout) {
})

.controller('PlaylistsCtrl', function($scope) {
})

controllers.js file

app.js file

project