[Question] C# enum & generic type issue

I have C# code

    public class AccountStatusModel
    {
        public Guid AccountId { get; set; }
        public UserStatus Status { get; set; }
    }

   [JsonConverter(typeof(JsonStringEnumConverter))]
    public enum UserStatus : int
    {
        Active      = 0,
        Suspend     = 1,
        Deleted     = 2
    }
    
    public class ApiGrid<T> 
    {
              public GridModel<T> Grid { get; set; }
    }

When performing openapi-generator-cli generate -i v1.json -g dart-dio -o ../../JobMobile/job/lib/services
It generate flutter dart

When performing flutter pub run build_runner build it didn't generate file "account_status_model.g.dart"
When I comment out this property "public UserStatus Status { get; set; }" regenerate everything work.
What wrong with the enum in C#?

Errors:

log output for built_value_generator:built_value on lib/services/lib/src/model/account_status_model.dart                 
E Error in BuiltValueGenerator for abstract class AccountStatusModel implements Built<AccountStatusModel, InvalidType>.  
  Please make the following changes to use BuiltValue:                                                                   
  1. Make field status have non-dynamic type. If you are already specifying a type, please make sure the type is         
  correctly imported.                                                                                                    
log output for built_value_generator:built_value on                                                                      
lib/services/lib/src/model/api_grid_of_company_admin_light_model.dart                                                    
E Error in BuiltValueGenerator for abstract class ApiGridOfCompanyAdminLightModel implements                             
  Built<ApiGridOfCompanyAdminLightModel, InvalidType>.                                                                   
  Please make the following changes to use BuiltValue:                                                                   
  1. Make field grid have non-dynamic type. If you are already specifying a type, please make sure the type is correctly 
  imported.                                                                                                              
log output for built_value_generator:built_value on lib/services/lib/src/model/api_grid_of_company_employer_model.dart   
E Error in BuiltValueGenerator for abstract class ApiGridOfCompanyEmployerModel implements                               
  Built<ApiGridOfCompanyEmployerModel, InvalidType>.                                                                     
  Please make the following changes to use BuiltValue:                                                                   
  1. Make field grid have non-dynamic type. If you are already specifying a type, please make sure the type is correctly 
  imported.                                                                                                            

Start with the v1.json input and the dart-dio generation command, then inspect the generated account_status_model.dart and api_grid_of_company_admin_light_model.dart files alongside the built_value_generator errors. Done means determining whether the enum and generic fields produce invalid Dart types and documenting or correcting the generator behavior so flutter pub run build_runner build generates the missing files.