angularjs ui-sortable: cannot call methods on sortable prior to initialization; attempted to call method 'refresh'

i'm trying to do sorting list, i take the element from the db but..

Error: cannot call methods on sortable prior to initialization; attempted to call method 'refresh'

my html:

<div class="box-body" >
                    <div ng:controller="menuConfigCtrl">
                        <ul ui-sortable ng-model="menu"  >
                            <li ng:repeat="item in menu |filter:'all' | orderBy:'order':false" >{{item.Title}}</li>
                        </ul>
                    </div>
                </div>

and my controller:

function menuConfigCtrl($location,$scope, menuFactory) {    
    $scope.menu = [];
    menuFactory.getMenu().success(function(data){
        $scope.menu = data;
    }); 
}

my getMenu() is:

getMenu : function(){
       return $http({
            url: '/api/menuList',
            method: 'GET',
        });
},

if i get the menu not from a rest service, but binding it, everyting work without error! what can be?

solved. i imported 2 times angularjs.js :P