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flutterdartflutter-freezed

Target of URI doesn't exist: 'className.freezed.dart'

I am new to flutter and after searching everywhere I couldn't find the reason behind this error

Below is my code

// ignore: file_names
import 'package:freezed_annotation/freezed_annotation.dart';
part 'NetworkResponse.freezed.dart';
@freezed
  class NetworkResponse with _$NetworkResponse {
    const factory NetworkResponse.success(Map<String, dynamic> data) = OK;
    const factory NetworkResponse.error(String message) = ERROR;
    const factory NetworkResponse.loading(String message) = LOADING;
}

Error

enter image description here

1) Target of URI doesn't exist: 'NetworkResponse.freezed.dart'.
2) Classes can only mix in mixins and classes.dartmixin_of_non_class
3) The name 'OK' isn't a type and can't be used in a redirected constructor.
Try redirecting to a different constructor.

Code Source: https://betterprogramming.pub/building-generic-and-performant-networking-layer-in-flutter-b25c2b1b89a4

Solution

  • In order for freezed generator to work, yours file names have to match.

    I suspect that your file is not named NetworkResponse.dart since it is not a flutter convention. Flutter convention is to name files with snake case - network_response.dart. In this case, your freezed file would be network_response.freezed.dart and it should be the string following the part keyword.

    With that implemented, you only have to run flutter pub run build_runner build. In case of any errors, --delete-conflicting-outputs flag should do the job. Also make sure to not only have freezed_annotation dependency in your pubspec.yaml but also freezed itself as a dev dependency.