ng-view doesn't work correctly - angularjs-ng-route

Question

I want to implement ngRoute in my angularjs project. But <ng-view></ng-view> doesn't show anything. I read all other posts about this problem, but my problem is not resolved.
I define $routeProvider in app.js file as follows:
'use strict'
angular.module('confusionApp', ['ngRoute'])
.config(['$routeProvider',function($routeProvider) {
$routeProvider
.when('/contactus', { // route for the contactus page
templateUrl : 'contactus.html', controller : 'ContactController'
})
.when('/menu', { // route for the menu pag
templateUrl : 'menu.html', controller : 'MenuController'
})
.when('/menu/:id', { // route for the dish details pag
templateUrl : 'dishdetail.html', controller : 'DishDetailController'
})
.otherwise('/contactus');
}]);
My controllers.js file includes the defenition of all my controllers:
angular.module('confusionApp')
.controller('MenuController', ['$scope','menuFactory',function($scope,menuFactory){
$scope.dishes = menuFactory.getDishes();
//other codes which deleted for simplicity
}])
.controller('dishDetailController',['$scope','$routeParams',
'menuFactory', function($scope,$routeParams,menuFactory){
var dish = menuFactory.getDish(parseInt($routeParams.id,10));
this.dish = dish;
//other codes which deleted for simplicity
}])
.controller('contactController',['$scope',function($scope){
//some code here
}])
.controller('feedbackController',['$scope',function($scope){
//some code here
}]);
And I defined factory in services.js file as follows:
angular.module('confusionApp')
.factory('menuFactory',function(){
var menufac = {};
var dishes=[{... some data ...}];
menufac.getDishes = function(){
return dishes;
};
menufac.getDish = function(index){
return dishes[index];
};
return menufac;
});
In my index.html page <ng-view></ng-view> doesn't show anything.for example when I click on menu tab, url become like this and menu data didn't reload:
http://localhost/conFusion/#!/contactus#%2Fmenu
my default page is contactus.
Also I define scripts in index.html as follows and all the paths are true.
<script src="../bower_components/angular/angular.min.js"></script>
<script src="../bower_components/angular-route/angular-route.min.js"></script>
<script src="scripts/app.js"></script>
<script src="scripts/controllers.js"></script>
<script src="scripts/services.js"></script>