问人体分割api调用，报'InvalidParameter.InvalidParameter'错误？

求助：人体分割api调用，报'InvalidParameter.InvalidParameter'错误，参数是这样的：

const client = new BdaClient(clientConfig);

const params = {

"Url": "https://images-1253299728.cos.ap-shanghai.myqcloud.com/resumes/751e5bdb03084a86e1c86ebd8b11e24f.jpg",

"RspImgType": "Url",

"Scene": "GEN"

};

client.SegmentPortraitPic(params).then(

  (data) => {

console.log(data);

  },

  (err) => {

console.error("error", err);

  }

);