cannot get error using angularjs with express.js

Question

I've a file of index.html that has

     <ui-view></ui-view>

in the body and below is my route.js :

var app = angular.module('dashboard', ['ui.router']);

app.config(['$stateProvider','$urlRouterProvider','$locationProvider', function($stateProvider, $urlRouterProvider, $locationProvider) {
    $locationProvider.html5Mode(true);

    $urlRouterProvider.otherwise('/');

    $stateProvider
            .state("home", {
                url: "/",
                template:"<h1>home</h1>"
            })
            .state("dashboard", {
                url: "/dashboard",
                templateUrl: "templates/dashboard.html",
                controller: "controllers/dashboardCtrl"
            })           
}]);

but I get error of Cannot GET /dashboard I wonder why. I did have a folder called templates and has a dashboard.html in it.