Angular - $cookies is undefined

我试图在我的控制器中使用Angular cookie，但由于某些原因，它总是未定义：

MyApp.controller('ValidationController', ["$cookies", function($cookies) {
    debugger; //checking $cookies here return an object
    $cookies.put("test","test"); //trying to add value to the cookie here return TypeError: undefined is not a function
    alert(JSON.stringify($cookies));
}]);

var MyApp = angular.module("MyApp", [
    "ui.router",
    "ui.bootstrap",
    "oc.lazyLoad",
    "ngSanitize",
    "ngCookies"
]);

这是全栈错误：

TypeError: undefined is not a function
    at new <anonymous> (CookiesController.js:6)
    at Object.e [as invoke] (angular.min.js:37)
    at $get.z.instance (angular.min.js:76)
    at angular.min.js:59
    at s (angular.min.js:7)
    at v (angular.min.js:59)
    at g (angular.min.js:52)
    at angular.min.js:51
    at angular.min.js:17
    at l.$get.l.$eval (angular.min.js:126)

有什么想法吗？