支付宝小程序报无效参数

Uncaught (in promise) {error: 2, errorMessage: "无效参数"}

loadCity: function (longitude, latitude) {
    console.log(longitude, latitude)

    return new Promise(function (resolve, reject) {
      my.request({
        url: 'https://api.map.baidu.com/geocoder/v2/',
        method: "get",
        data: {
          ak: 'fZFXohYk16dGFbGEMow2Tz0vuxILoman',
          location: latitude + ',' + longitude,
          output: 'json'
        },
        success: function (res) {
          console.log(res)
          if (res.status == '200') {
            resolve({
              citycode: res.data.result.addressComponent.adcode
            });
          }
        },
        fail: function () {
          resolve("");
        }
      })
    }).catch((e) => {
      console.log('catch:', e);
    })
  }

app.loadCity(longitude, latitude).then(res => {})