为什么我得到未定义的不是函数？

我正在尝试使用有角度的UI pop over来制作popover。我加载了html并使其符合HTml，但是当我运行程序并单击ICon（我在其中显示pop over的星形图标）时，我得到了undefined错误不是一个函数吗？

http://plnkr.co/edit/o0mVZujOH0Apqurvq9xX?p=预览

我用了这些线

     <td ><span   pop-over items="items", title="Mode of transport" class="glyphicon glyphicon-star content"></span> </td>

app.directive('popOver', function ($compile) {
  var itemsTemplate ="<div ng-controller='AfterCtrl'><ul class='list-group'><li class='list-group-item' ng-click='editRowName()'>Edit</li><li class='list-group-item ' ng-click='deleteRow($index)'>Delete</li></ul></div>" ;
  var getTemplate = function (contentType) {
    var template = '';
    switch (contentType) {
      case 'items':
        template = itemsTemplate;
        break;
    }
    return template;
  }
  return {
    restrict: "A",
    transclude: true,
    template: "<span ng-transclude></span>",
    link: function (scope, element, attrs) {
      var popOverContent;
      if (scope.items) {
        var html = getTemplate("items");
        popOverContent = $compile(html)(scope);
      }
      var options = {
        content: popOverContent,
        placement: "bottom",
        html: true,
        title: "aa"
      };
      $(element).popover(options);
    },
    scope: {
      items: '=',
      title: '@'
    }
  };
});