我也有同样的问题（它曾经工作）。
import 'dart：convert';
import 'model_exports. dart';
class FIDS_FlightUpdate {

GreatCircleDistance? greatCircleDistance ;
DepartingDepartureInfo?  departure;
DepartingArrivalInfo?    arrival;

String? lastUpdatedTimeUtc ; //Example:"2021-10-04 18:20Z"
String? number;  //Example:"AF 3139"
String? callSign;
String? status;  //Example:"Departed"
String? codeshareStatus;  //example:"IsCodeshared"
bool?   isCargo;  //Example:false
FIDS_Aircraft? aircraft;
FIDS_Airline? airline;

}给出错误消息......无法将FIDS_FlightUpdate转换为数据类：类没有唯一的属性名！
我没有看到任何重复的属性名称。