cannot generate g dart file with flutter pub run build_runner build which class is shown below and getting this error just because of enum parameter:

enum Salescategory { sales, salesReturn, salesPurchase }

@Entity()
class SalesConverterModel {
  @Id()
  int? id;
  @Property()
  Salescategory salesCategory;
  PartyModel? partyName;
  String? broker;
  String? onAc;
  String? outstate;
  String? qaulity;

  SalesConverterModel({
    this.id,
    this.salesCategory = Salescategory.sales,
    this.partyName,
    this.broker,
    this.onAc,
    this.outstate,
    this.qaulity,
  });
}