I'm trying to configure my route in such a way to redirect to the login page if user is not logged. This is my code:

angular.module('witBiz.services', []);

angular.module('witBiz.controllers', ['witBiz.services']);

var witBizModule = angular.module('witBiz', ['ngRoute' , 'witBiz.controllers', 'witBiz.services'   ]);



witBizModule.config(['$routeProvider', function($routeProvider) {

    $routeProvider.when('/login', {templateUrl: 'resources/views/login.html', controller: 'LoginController'});

    $routeProvider.when('/index', {templateUrl: 'resources/views/index.html', controller: 'IndexController'});

    $routeProvider.otherwise({redirectTo: 'resources/views/index.html'});

}])

    .run(['$rootScope',  'checkLogin', function($rootScope, checkLogin ,$routeProvider ) {

        $rootScope.$on('$routeChangeSuccess', function () {

           if (checkLogin())

                $location.url(/index);

        })

    }])

    .factory('checkLogin', function(){

        return function() {

            //perform real logic here

            return true;

        }

    })

where basically I declare modules and services. Now the problem is $location is not defined so I get error.
I tried to inject $location as dependency like this but I got undefined injection (injpt):

.run(['$rootScope',  'checkLogin', '$location', function($rootScope, checkLogin ,$location) {

        $rootScope.$on('$routeChangeSuccess', function () {

           if (checkLogin())

                $location.url(/ciao);

        })

    }])

So I'm wondering how I can use the builtin $location services inside my run method...why can I inject it as a dependency as $rootScope or checkLogin?!

I'm using angular 1.2.0 rc2.

Thanks