User Model Error:type '_Map<String, dynamic>' is not a subtype of type 'List<dynamic>' in type cast

I need help with this UserModel and this UserEntity when I tried to read json from firebase. I have problems with retrieve a map from firebase. I have this error:type '_Map<String, dynamic>' is not a subtype of type 'List<dynamic>' in type cast.
I am not sure how to do this correctly
Can you help me?

Here is my code:

User Model:

class UserModel extends UserEntity {
  const UserModel(
      {super.name,
      super.uid,
      super.ins,
   });

  factory UserModel.fromSnapshot(DocumentSnapshot snap) {
    var snapshot = snap.data() as Map<String, dynamic>;

    return UserModel(
        uid: snapshot['uid'],
        name: snapshot['name'],
        ins: (snapshot['ins'] as List)
            .map((e) => InsModel.fromSnapshot(e))
            .toList(),
      );
  }

  Map<String, dynamic> toJson() => {
        'uid': uid,
        'name': name,
        'ins': ins
      };
}

class InsModel extends InsEntity {
  const InsModel({super.category, super.type, super.owned});

  factory InsModel.fromSnapshot(DocumentSnapshot snap) {
    var snapshot = snap.data() as Map<String, dynamic>;

    return InsModel(
        category: snapshot['category'],
        type: snapshot['type'],
        owned: snapshot['owned']);
  }

  Map<String, dynamic> toJson() =>
      {'category': category, 'type': type, 'owned': owned};
}

User Entity:

class UserEntity extends Equatable {
  final String? uid;
  final String? name;
  final List<InsEntity>? ins;

  const UserEntity(
      {
      this.uid,
      this.name,
      this.ins
     });

  @override
  List<Object?> get props => [
        uid,
        name,
        ins,
      ];
}

class InsEntity extends Equatable {
  final String? category;
  final String? type;
  final bool? owned;

  const InsEntity({this.category, this.type, this.owned});

  @override
  List<Object?> get props => [category, type, owned];
}

It looks like ins is a map and not a list. So a user has only one of them. Then you need to change in the entity

final List<InsEntity>? ins;

to

final InsEntity? ins;

and in the model

return UserModel(
    uid: snapshot['uid'],
    name: snapshot['name'],
    ins: (snapshot['ins'] as List)
        .map((e) => InsModel.fromSnapshot(e))
        .toList(),
  );

to

return UserModel(
    uid: snapshot['uid'],
    name: snapshot['name'],
    ins: InsModel.fromSnapshot(snapshot['ins']),
  );

and change the fromSnapshot of InsModel to

  factory InsModel.fromSnapshot(Map<String, dynamic> snapshot ) {
    return InsModel(
        category: snapshot['category'],
        type: snapshot['type'],
        owned: snapshot['owned']);
  }

(and maybe rename it to fromMap)