微信群发40003错误

[qq_37653286]

传下面这种JSON格式就会报40003错误
{
"touser": [
"OPENID",
"OPENID"
],
"mpnews": {
"media_id": "media_id"
},
"msgtype": "mpnews",
"send_ignore_reprint": 0
}
传下面这种JSON格式就是正常的
{
"touser": "OPENID1",
"mpvideo":{
"media_id":"123dsdajkasd231jhksad",
"title":"TITLE",
"description":"DESCRIPTION"
},
"msgtype":"mpvideo"
}
OPENID都是重测试号里面获取到的,这是为什么呢?来个大牛帮忙解决一下