获取直播列表报错

 $url = "http://api.weixin.qq.com/wxa/business/getliveinfo?access_token=".$token_info;

        $params = array(

            "start" => 0,

            "limit" => 10

        );

        $room_info = json_decode(self::https_post($url,$params),true);

Array
(
    [errcode] => 47001
    [errmsg] => data format error hint: [nEHfWa05754812]
)