step 3 is not running successfully.

[AlijonovMukhammaddiyor]

I am cloning the project and running flutter pub get and then running flutter packages pub run build_runner watch but it is failing.

[INFO] Generating build script...
[INFO] Generating build script completed, took 220ms

[INFO] Creating build script snapshot......
[WARNING] stderr: Info: Compiling without sound null safety!
[WARNING] stderr: Dart 3 will only support sound null safety, see https://dart.dev/null-safety
[INFO] Creating build script snapshot... completed, took 7.0s

[INFO] Setting up file watchers...
[INFO] Setting up file watchers completed, took 10ms

[INFO] Waiting for all file watchers to be ready...
[INFO] Waiting for all file watchers to be ready completed, took 200ms



You have hit a bug in build_runner
Please file an issue with reproduction steps at https://github.com/dart-lang/build/issues


AssetNotFoundException: boilerplate|.packages
package:build_runner_core/src/asset/file_based.dart 135:18  _fileForOrThrow.<fn>
dart:async                                                  _CustomZone.runUnary
package:build_runner/src/generate/watch_impl.dart 329:20    WatchImpl._run.<fn>

I have tried flutter clean, deleting .dart_tools folder but they did not change anything. I have also tried flutter upgrade and flutter packages upgrade.

[thanhdevapp]

same problem

[tusharuit25]

name: boilerplate
description: A flutter boilerplate project created using MobX and Provider.

version: 1.0.0+1

environment:
sdk: ">=2.15.0 <3.7.7"

dependencies:
flutter:
sdk: flutter

flutter_localizations:
sdk: flutter
flutter_cupertino_localizations: ^1.0.1
cupertino_icons: ^1.0.3
shared_preferences: ^2.0.6
http: ^0.13.3
mobx: ^2.0.1
flutter_mobx: ^2.0.0
provider: ^5.0.0
validators: ^3.0.0
dio: ^4.0.0
another_flushbar: ^1.10.23
material_dialog: ^1.0.0-nullsafety.1
intl: any
xxtea: ^2.1.0
sembast: ^3.1.0+2
path_provider: ^2.0.2
get_it: ^7.1.3

google_fonts: ^2.3.2

dev_dependencies:
flutter_test:
sdk: flutter

flutter_launcher_icons: ^0.12.0
mobx_codegen: ^2.1.1
build_runner: ^2.3.3
analyzer: ^5.10.0

flutter_icons:
image_path: "assets/icons/ic_launcher.png"
android: true
ios: true

flutter:

uses-material-design: true

assets:

• assets/images/
• assets/icons/
• assets/lang/

fonts:

• family: ProductSans
  fonts:
  • asset: assets/fonts/Product-Sans-Regular.ttf
  • asset: assets/fonts/Product-Sans-Italic.ttf
    style: italic
  • asset: assets/fonts/Product-Sans-Bold.ttf
    weight: 700

[tusharuit25]

hope this solves your problem @zubairehman kindly update your pubspec.yml

[alon42]

Thanks @tusharuit25
implemented your suggestions into the code, changing to the next pubspec.yml worked for me:

name: boilerplate
description: A flutter boilerplate project created using MobX and Provider.

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# Read more about versioning at semver.org.
version: 1.0.0+1

environment:
  sdk: ">=2.15.0 <3.7.7"

dependencies:
  flutter:
    sdk: flutter

  flutter_localizations:
    sdk: flutter
  flutter_cupertino_localizations: ^1.0.1

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.3

  # The following adds the shared pref as a dependency in your application
  shared_preferences: ^2.0.6

  # A composable, Future-based library for making HTTP requests.
  http: ^0.13.3

  # Flogs, a powerful logging framework
#  f_logs: ^1.2.2

  # MobX is a library for reactively managing the state of your applications. Use the power of
  # observables, actions, and reactions to supercharge your Dart and Flutter apps.
  mobx: ^2.0.1
  flutter_mobx: ^2.0.0

  # An helper to easily exposes a value using InheritedWidget without having to write one.
  provider: ^5.0.0

  # String validation and sanitization for Dart. Dart 2-compatible version of validator
  validators: ^3.0.0

  # A powerful Http client for Dart
  dio: ^4.0.0

  # A flexible widget for user notification. Customize your text, button, duration, animations
  # and much more. For Android devs, it is made to replace Snackbars and Toasts.
  another_flushbar: ^1.10.23

  # Material Dialog
  material_dialog: ^1.0.0-nullsafety.1

  # This package provides internationalization and localization facilities, including message
  # translation, plurals and genders, date/number formatting and parsing, and bidirectional text.
  intl: ^0.17.0

  # XXTEA is a fast and secure encryption algorithm. This is a XXTEA library for Dart.
  xxtea: ^2.1.0

  # An helper to easily exposes a value using InheritedWidget without having to write one.
  sembast: ^3.1.0+2
  path_provider: ^2.0.2

  # for dependency injection
  get_it: ^7.1.3

  google_fonts: ^2.3.2

dev_dependencies:
  flutter_test:
    sdk: flutter

  # The following adds the launcher icon support to your application.
  # run below mentioned commands to generate launcher icons
  # flutter packages get
  # flutter packages pub run flutter_launcher_icons:main
  flutter_launcher_icons: ^0.12.0
  mobx_codegen: ^2.1.1
  build_runner: ^2.3.3
  analyzer: ^5.10.0
  

flutter_icons:
  image_path: "assets/icons/ic_launcher.png"
  android: true
  ios: true


# For information on the generic Dart art of this file, see the
# following page: https://www.dartlang.org/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  assets:
  - assets/images/
  - assets/icons/
  - assets/lang/

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.io/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies, see
  # https://flutter.io/assets-and-images/#from-packages

  # To add custom fonts to your application, 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: ProductSans
    fonts:
    - asset: assets/fonts/Product-Sans-Regular.ttf
    - asset: assets/fonts/Product-Sans-Italic.ttf
      style: italic
    - asset: assets/fonts/Product-Sans-Bold.ttf
      weight: 700

  # For details regarding fonts from package dependencies,
  # see https://flutter.io/custom-fonts/#from-packages