plz Can someone help me !!,i get error when i call the data from json api, When i test my api in Postman, everything works fine, but as soon as I run the code, I receive the following error: i think the error cause of when i declare the list carslist, i think it's not true: List<CarWasher> carsList = [];

enter image description here

this is my model:

import 'dart:convert';

CarWasher emptyFromJson(String str) => CarWasher.fromJson(json.decode(str));

String emptyToJson(CarWasher data) => json.encode(data.toJson());

class CarWasher {
    required this.bookings,

  Now now;
  List<Now> bookings;

  factory CarWasher.fromJson(Map<String, dynamic> json) => CarWasher(
    now: Now.fromJson(json["now"]),
    bookings: List<Now>.from(json["bookings"].map((x) => Now.fromJson(x))),

  Map<String, dynamic> toJson() => {
    "now": now.toJson(),
    "bookings": List<dynamic>.from( => x.toJson())),

class Now {
    required this.userId,
    required this.bookingTypeId,
    required this.carWasherId,
    required this.buildingId,
    required this.serviceId,
    required this.packageId,
    required this.vehiculeId,
    required this.status,
    required this.dateTime,
    required this.longitude,
    required this.latitude,
    required this.createdAt,
    required this.updatedAt,
    required this.location,
    required this.duration,
    required this.start,
    required this.end,

  int id;
  int userId;
  int bookingTypeId;
  int carWasherId;
  int buildingId;
  int serviceId;
  int packageId;
  int vehiculeId;
  dynamic tookenPackageId;
  String status;
  DateTime dateTime;
  DateTime date;
  dynamic address;
  double longitude;
  double latitude;
  dynamic rate;
  DateTime createdAt;
  DateTime updatedAt;
  String location;
  int duration;
  String start;
  String end;

  factory Now.fromJson(Map<String, dynamic> json) => Now(
    id: json["id"],
    userId: json["userId"],
    bookingTypeId: json["bookingTypeId"],
    carWasherId: json["carWasherId"],
    buildingId: json["buildingId"],
    serviceId: json["serviceId"],
    packageId: json["packageId"] == null ? null : json["packageId"],
    vehiculeId: json["vehiculeId"],
    tookenPackageId: json["tookenPackageId"],
    status: json["status"],
    dateTime: DateTime.parse(json["dateTime"]),
    date: DateTime.parse(json["date"]),
    address: json["address"],
    longitude: json["longitude"] == null ? null : json["longitude"].toDouble(),
    latitude: json["latitude"] == null ? null : json["latitude"].toDouble(),
    rate: json["rate"],
    createdAt: DateTime.parse(json["created_at"]),
    updatedAt: DateTime.parse(json["updated_at"]),
    location: json["location"],
    duration: json["duration"],
    start: json["start"],
    end: json["end"],

  Map<String, dynamic> toJson() => {
    "id": id,
    "userId": userId,
    "bookingTypeId": bookingTypeId,
    "carWasherId": carWasherId,
    "buildingId": buildingId,
    "serviceId": serviceId,
    "packageId": packageId == null ? null : packageId,
    "vehiculeId": vehiculeId,
    "tookenPackageId": tookenPackageId,
    "status": status,
    "dateTime": dateTime.toIso8601String(),
    "date": "${date.year.toString().padLeft(4, '0')}-${date.month.toString().padLeft(2, '0')}-${, '0')}",
    "address": address,
    "longitude": longitude == null ? null : longitude,
    "latitude": latitude == null ? null : latitude,
    "rate": rate,
    "created_at": createdAt.toIso8601String(),
    "updated_at": updatedAt.toIso8601String(),
    "location": location,
    "duration": duration,
    "start": start,
    "end": end,

this is my http function:

Future<List<CarWasher>> _getCarWasher() async {
    var  value = await token_read();
    String url = "xxxxx/xxxx/xxxxxxx";

      final http.Response response = await http.get(Uri.parse(url),headers: {
        'Authorization' :'Bearer $value',

       print("Status Code: ${response.statusCode}");
      if (response.statusCode == 200) {

        final jsonItems = json.decode(response.body).cast<Map<String, dynamic>>();

        List<CarWasher> carsList =<CarWasher>((json) {
          return CarWasher.fromJson(json);

        return carsList;

      } else {
        throw Exception("Unable to retrieve data.");

i think this is the cause:

enter image description here