Flutter Serializing objects types problem

Issue I’m using the json_serializable: ^6.3.1 pub package to auto generate toJson() & FromJson() and i’m having this class import ‘package:json_annotation/json_annotation.dart’; part ‘maintenance_super_request.g.dart’; @JsonSerializable() class MaintenanceSuperRequest extends DetailedRequest { // String? sp_key; final List<String> services; final Unit unit; double? totalCost;

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