build_runner failed after upgrading my flutter

[casontek]

i am unable to generate my model file after upgrading my flutter and dart sdk

dart --version Dart SDK version: 3.5.0-103.0.dev (dev) (Thu Apr 25 17:03:06 2024 -0700) on "macos_x64"

flutter --version Flutter 3.22.0-18.0.pre.30 • channel master • https://github.com/flutter/flutter.git Framework • revision 5f0628d335 (11 days ago) • 2024-04-26 02:23:26 -0400 Engine • revision d794580077 Tools • Dart 3.5.0 (build 3.5.0-103.0.dev) • DevTools 2.35.0-dev.8

pubspec.yaml

environment: sdk: '>=3.3.0-273.0.dev <4.0.0'

dev_dependencies: flutter_test: sdk: flutter bloc_test: ^9.1.3 build_runner: ^2.4.9 json_serializable: ^6.7.1

model object

import 'package:json_annotation/json_annotation.dart';

part 'p_user.g.dart';

@JsonSerializable() class User { String name; String phone; String state; String country; String address;

User({ this.name = '', this.phone = '', this.country = '', this.address = '' });

factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);

Map<String, dynamic> toJson() => _$UserToJson(this);

}

Build Error

[INFO] Precompiling build script... completed, took 147ms [SEVERE] Failed to precompile build script .dart_tool/build/entrypoint/build.dart. This is likely caused by a misconfigured builder definition.