Facebook PHP图形API不返回完整的数据

我有一个问题与Facebook的PHP SDK版本4.0。

我只是想通过图形API检索insights/page_fans_city指标:

$request = new FacebookRequest($session, 'GET', 
    '/{my object}/insights/page_fans_city', 
    array('period' => 'lifetime'));
$response = $request->execute();
$client_graph_object = $response->getGraphObject();
print_r($client_graph_object);

但是，不返回任何数据:

Facebook'GraphObject Object
(
[backingData:protected] => Array
    (
        [data] => Array
            (
            )
        [paging] => stdClass Object
            (
                [previous] => https://graph.facebook.com/v2.0/...
                [next] => https://graph.facebook.com/v2.0/...
            )
    )
)

我知道我有我要的洞察号数据。我可以通过图形资源管理器发出完全相同的请求:

→/v.2.0/{我对象}/观点/page_fans_city吗?时间=一生

{
  "data": [
    {
      "id": "{my object}/insights/page_fans_city/lifetime", 
      "name": "page_fans_city", 
      "period": "lifetime", 
      "values": [
        {
          "value": {
            ...
          },
          "end_time": "2014-08-01T07:00:00+0000"
        },
        {
          "value": {
            ...
          },
          "end_time": "2014-08-02T07:00:00+0000"
        }
      ], 
      "title": "Lifetime Likes by City", 
      "description": "Lifetime: Aggregated Facebook location data, sorted by city, about the people who like your Page. (Unique Users)"
    }
  ], 
  "paging": {
    "previous": "https://graph.facebook.com/v2.0/..., 
    "next": "https://graph.facebook.com/v2.0/...
  }
}

我应该注意，如果省略page_fans_city段，我am接收数据。当它被省略时-我只能查看page_fans_country的数据。因此

$request = new FacebookRequest($session, 'GET', 
    '/{myobject}/insights/page_fans_country', 
    array('period' => 'lifetime'));

和

$request = new FacebookRequest($session, 'GET', 
    '/{myobject}/insights', 
    array('period' => 'lifetime'));

将为我工作…

我怀疑这是我的访问令牌-但我不确定为什么会这样。我创建的应用程序只需要read_insights权限。

提前谢谢你
Mike