Error submenu treeview

[yenop]

Hello, I can not operate the menu to submenu treeview.

In sideBar.html :

    <ul class="treeview-menu" ng-if="menu.children">
        <li ng-repeat="child in menu.children" ng-show="child.active">
            <a ui-sref="{{child.state}}"><i class="{{child.class}}"></i>{{child.text}}</a>
        </li>
    </ul>