Flutter 未处理的异常：类型'_内部链接dhashmap<；动态，动态>'；不是类型为'；地图<；字符串，动态>'；飞镖

我试图解析json响应，但我有这个错误，我不知道为什么。错误发生在数据对象内部。因为当我移除这个物体时，它工作得非常好。我需要知道我做错了什么

class TripDetails {
  String operatorId;
  String title;
  String body;
  Data data;

  TripDetails({this.operatorId, this.title, this.body, this.data});

  TripDetails.fromJson(Map<String, dynamic> json) {
    operatorId = json['operatorId'];
    title = json['title'];
    body = json['body'];
    data = json['data'] != null ? new Data.fromJson(json['data']) : null;
  }

}

class Data {
  String clickAction;
  String tripId;
  String tripType;
  String date;
  String earning;
  String distance;
  String stores;

  Data(
      {this.clickAction,
        this.tripId,
        this.tripType,
        this.date,
        this.earning,
        this.distance,
        this.stores});

  Data.fromJson(Map<String, dynamic> json) {
    clickAction = json['click_action'];
    tripId = json['tripId'];
    tripType = json['trip_type'];
    date = json['date'];
    earning = json['earning'];
    distance = json['distance'];
    stores = json['stores'];
  }

更改此项：

Data.fromJson(Map<String, dynamic> json) {

---

发布解析代码。

Data.fromJson(Map<String, dynamic> json) {

Data.fromJson(Map json) {