调用公众号群发接口，报40008错误，参数的格式和官方文档是一样的

{"filter":{"is_to_all":true},"mpnews":{"media_id":"dguVkLqFd-SyvBevNQPVDWYVgW0DJcEt7IPzZ7Hmfg3xOguXhAhesGnQgL4617Ek"},"send_ignore_reprint":0,"msgtype":"mpnews"}

String accessToken = null;
if(getAccessToken()!=null){
    accessToken=getAccessToken();
}
boolean b = true;
String url=" https://api.weixin.qq.com/cgi-bin/message/mass/sendall?access_token="+accessToken;
JSONObject jsonObject=new JSONObject();
JSONObject filter=new JSONObject();
filter.put("is_to_all",b);
JSONObject mpnews=new JSONObject();
mpnews.put("media_id",mediaId);
jsonObject.put("filter",filter);
jsonObject.put("mpnews",mpnews);
jsonObject.put("send_ignore_reprint",0);
jsonObject.put("msgtype","mpnews");
System.out.println(jsonObject);
String response=HttpUtil.post(url,jsonObject);
JSONObject jsonObject2=JSONObject.parseObject(response);
Long msg_data_id= (Long) jsonObject2.get("publish_status");