NoSuchMethodError: Class ‘List’ has no instance method ‘Map’.
Receiver: Instance(length:0) of ‘_GrowableList’
Tried calling: Map(Closure: (dynamic) => Map<String, dynamic>)
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i am getting this when i enter my correct information even i use print state ment i am getting the correct info from database but getting this problem and if i enter wrong if in the console i am getting wrong password or user not fount but the is on other eror this is the error that iam getting when i enter wrong info click here to see type ‘Null’ is not a subtype of type ‘String

i added context .mounted in my flutter codes
My user Model

// ignore_for_file: public_member_api_docs, sort_constructors_first
class User {
  final String id;
  final String name;
  final String email;
  final String password;
  final bool isAdmin;
  final int phone;
  final String address;
  final List<dynamic>? cart;
  final List<dynamic>? wishlist;
  User({
    required this.id,
    required this.name,
    required this.email,
    required this.password,
    required this.isAdmin,
    required this.phone,
    required this.address,
    this.cart,
    this.wishlist,
  });

  Map<String, dynamic> toMap() {
    return <String, dynamic>{
      'id': id,
      'name': name,
      'email': email,
      'password': password,
      'isAdmin': isAdmin,
      'phone': phone,
      'address': address,
      'cart': cart,
      'wishlist': wishlist,
    };
  }

  factory User.fromMap(Map<String, dynamic> map) {
    return User(
      id: map['_id'] ?? '',
      name: map['name'] ?? '',
      email: map['email'] ?? '',
      password: map['password'] ?? '',
      isAdmin: map['isAdmin'] ?? false,
      phone: map['phone'] ?? 0,
      address: map['address'] ?? '',
      cart:  List<Map<String, dynamic>>.from((map['cart']?.Map((x)=> Map<String,dynamic>.from(x)) )) ,
      wishlist: List<Map<String,dynamic>>.from((map['wishlist']?.Map((x)=> Map<String, dynamic>.from(x))),
    ));
  }

  String toJson() => json.encode(toMap());

  factory User.fromJson(String source) => User.fromMap(json.decode(source) as Map<String, dynamic>);

  User copyWith({
    String? id,
    String? name,
    String? email,
    String? password,
    bool? isAdmin,
    int? phone,
    String? address,
    List<dynamic>? cart,
    List<dynamic>? wishlist,
  }) {
    return User(
      id: id ?? this.id,
      name: name ?? this.name,
      email: email ?? this.email,
      password: password ?? this.password,
      isAdmin: isAdmin ?? this.isAdmin,
      phone: phone ?? this.phone,
      address: address ?? this.address,
      cart: cart ?? this.cart,
      wishlist: wishlist ?? this.wishlist,
    );
  }
}

my login function

    required BuildContext context,
    required String email,
    required String password,
  }) async {
    try {
      http.Response res = await http.post(Uri.parse('$url/api/users/login'),
          headers: {"Content-Type": "application/json"},
          body: jsonEncode({
            "email": email,
            "password": password,
          }));

      print(res.statusCode);
      print(res.body);

      SharedPreferences preferences = await SharedPreferences.getInstance();

      preferences.setString('userId', jsonDecode(res.body)['_id']);
      if (context.mounted) {
        Provider.of<Userprovider>(context, listen: false).setUser(res.body);
      }

      if (res.statusCode == 200) {
        if (context.mounted) {
          showSnack(context, "Welcome");
          bool isAdmin = jsonDecode(res.body)['isAdmin'];
          isAdmin
              ? Navigator.pushNamed(context, AdminScreen.routeName)
              : Navigator.pushNamed(context, HomeScreen.routeName);
        }
      } else {
        if (context.mounted) {
          showSnack(context, res.body);
        }
      }
    } catch (e) {
      if (context.mounted) {
        showSnack(context, e.toString());
      }
    }
  }

my user provider

import 'package:softiweer_shop/models/user_model.dart';

class Userprovider extends ChangeNotifier {
  User users = User(
      id: '',
      name: '',
      email: '',
      password: '',
      isAdmin: false,
      phone: 0,
      address: '',
      cart: [],
      wishlist: []);

  User get _user => users;

  void setUser(String user) {
    users = User.fromJson(user);
    notifyListeners();
  }

  void setFromModel(User user) {
    users = user;
    notifyListeners();
  }
}