Non-nullable instance field 'reverseMap' must be initialized.

[daynial132]

i am getting -->Non-nullable instance field 'reverseMap' must be initialized.<-- error on { EnumValues(this.map) ; } in products.dart file can you guide me how to resolve it and what does it means

[sat4talk]

you could make reverseMap nullable by using
Map<T, String>? reverseMap;
instead of
Map<T, String> reverseMap;

there are still more errors. if interested tell me.. I have resolved all errors successfully