问颤振:找不到包裹"build_runner“

EN

import 'package:hive/hive.dart';

part 'user_model_hive.g.dart';

@HiveType()
class UserModelHive extends HiveObject {
  @HiveField(0) 
  DateTime id;
  @HiveField(1)
  String giverName;
  @HiveField(2)
  String pinCodeNumber;

  UserModelHive({this.id, this.giverName, this.pinCodeNumber});
}

name: network
description: A new Flutter package project.
version: 0.0.1
author:
homepage:

environment:
  sdk: ">=2.1.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  hive: ^1.1.1
  hive_flutter: ^0.2.1
dev_dependencies:
  flutter_test:
    sdk: flutter
  hive_generator: ^0.5.2
  build_runner: ^1.7.2

# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:
  # To add assets to your package, add an assets section, like this:
  # assets:
  #  - images/a_dot_burr.jpeg
  #  - images/a_dot_ham.jpeg
  #
  # For details regarding assets in packages, see
  # https://flutter.dev/assets-and-images/#from-packages
  #
  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware.
  # To add custom fonts to your package, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts in packages, see
  # https://flutter.dev/custom-fonts/#from-packages