Some times oc.lazyLoad not working properly in angularjs?

Question

Am working on the Angularjs project in which there is requirement to load the css and js files on demand, For this purpose i used the oc.lazyLoad library in angularjs, but some times pages loaded fines and some times it produce errors with loaded files. Following are my code:

    .state('datetimepickers', {
        url: "/date-time-picker",
        templateUrl: "views/date-time-picker.php",
        data: {pageTitle: 'Date-Time Pickers'},
        controller: "DateTimePickerController", 
        resolve: {
            deps: ['$ocLazyLoad', function($ocLazyLoad) {
                return $ocLazyLoad.load({
                    name: 'datetimepicker',
                    insertBefore: '#ng_load_plugins_before', // load the above css files before a LINK element with this ID. Dynamic CSS files must be loaded between core and theme css files
                    files: [
                        'assets/global/plugin/bootstrap-datepicker/css/datepicker.css',
                        'assets/global/plugin/bootstrap-datepicker/css/bootstrap-datetimepicker.min.css',
                        'assets/global/plugin/bootstrap-datepicker/css/bootstrap-timepicker.min.css',
                        'assets/global/plugin/bootstrap-datepicker/css/daterangepicker.css',
                        'assets/global/plugin/bootstrap-datepicker/css/clockface.css',

                        'assets/global/plugin/bootstrap-datepicker/js/bootstrap-datepicker.js',
                        'assets/global/plugin/bootstrap-datepicker/js/bootstrap-timepicker.js',
                        'assets/global/plugin/bootstrap-datepicker/js/clockface.js',
                        'assets/global/plugin/bootstrap-datepicker/js/bootstrap-datetimepicker.min.js',
                        'assets/global/plugin/bootstrap-datepicker/js/moment.js',
                        'assets/global/plugin/bootstrap-datepicker/js/daterangepicker.js',

                        'js/controllers/DateTimePickerController.js'
                    ] 
                });
            }]
        } 
    })

some times its works just fine , but when page reload it produce errors like:

Error: moment is not a function DateRangePicker@http://localhost/angular/angular/assets/global/plugin/bootstrap-datepicker/js/daterangepicker.js:34:26 $.fn.daterangepicker/<@http://localhost/angular/angular/assets/global/plugin/bootstrap-datepicker/js/daterangepicker.js:1615:40 .each@http://localhost/angular/angular/assets/global/js/jquery-2.2.4.min.js:2:2859 n.prototype.each@http://localhost/angular/angular/assets/global/js/jquery-2.2.4.min.js:2:843 $.fn.daterangepicker@http://localhost/angular/angular/assets/global/plugin/bootstrap-datepicker/js/daterangepicker.js:1611:9 @http://localhost/angular/angular/js/controllers/DateTimePickerController.js:132:5 vf/this.$gethttp://localhost/angular/angular/assets/global/plugin/angularjs/angular.min.js:147:42 k@http://localhost/angular/angular/assets/global/plugin/angularjs/plugins/angular-ui-router.min.js:7:23267 y/k.compile/http://localhost/angular/angular/assets/global/plugin/angularjs/plugins/angular-ui-router.min.js:7:23401 vf/this.$gethttp://localhost/angular/angular/assets/global/plugin/angularjs/angular.min.js:147:483 v/y.transitionTo/y.transition<@http://localhost/angular/angular/assets/global/plugin/angularjs/plugins/angular-ui-router.min.js:7:18767 e/<@http://localhost/angular/angular/assets/global/plugin/angularjs/angular.min.js:130:409 vf/this.$gethttp://localhost/angular/angular/assets/global/plugin/angularjs/angular.min.js:145:103 vf/this.$gethttp://localhost/angular/angular/assets/global/plugin/angularjs/angular.min.js:142:165 vf/this.$gethttp://localhost/angular/angular/assets/global/plugin/angularjs/angular.min.js:145:399 l@http://localhost/angular/angular/assets/global/plugin/angularjs/angular.min.js:97:248 K@http://localhost/angular/angular/assets/global/plugin/angularjs/angular.min.js:101:373 gg/http://localhost/angular/angular/assets/global/plugin/angularjs/angular.min.js:102:397