问服务端集成调用推送接口im_push的时候报错？

服务端集成调用推送接口im_push的时候传参

{

"MsgRandom": "79815602",

"MsgBody": [{

"MsgType": "TIMTextElem",

"MsgContent": {

"Text": "a"

}

}]

}

看参数没有问题啊

报错信息:{"ActionStatus":"FAIL","ErrorInfo":"parse request body error,please check it","ErrorCode":90010}