Can't Build the Project, The class 'FileSystemEvent' can't be extended, implemented, or mixed in outside of its library

[ncvescera]

I am currently following the 'First Time Contribution' guide to set the project up.
I already installed Flutter, Dart, Android Studio and System Dependencies.
I am inside the project's folder and I'm running the following command:

OS: Arch Linux

flutter pub get && dart run build_runner build --delete-conflicting-outputs --enable-experiment=records,patterns

that gives me the following output:

Resolving dependencies...
  _fe_analyzer_shared 52.0.0 (64.0.0 available)
  analyzer 5.4.0 (6.2.0 available)
  app_package_maker 0.0.9 (0.3.4 available)
  app_package_maker_aab 0.0.9 (0.2.3 available)
  app_package_maker_apk 0.0.9 (0.2.3 available)
  app_package_maker_deb 0.0.9 (0.2.3 available)
  app_package_maker_dmg 0.0.9 (0.2.3 available)
  app_package_maker_exe 0.0.9 (0.2.3 available)
  app_package_maker_ipa 0.0.9 (0.2.3 available)
  app_package_maker_zip 0.0.9 (0.2.3 available)
  archive 3.3.2 (3.3.7 available)
  args 2.4.1 (2.4.2 available)
  audio_service 0.18.9 (0.18.10 available)
  audio_session 0.1.13 (0.1.16 available)
  build 2.3.1 (2.4.1 available)
  build_daemon 3.1.0 (4.0.0 available)
  build_resolvers 2.1.0 (2.2.1 available)
  build_runner 2.3.3 (2.4.6 available)
  build_runner_core 7.2.7 (7.2.10 available)
  built_value 8.4.3 (8.6.1 available)
  buttons_tabbar 1.3.6 (1.3.7+1 available)
  checked_yaml 2.0.2 (2.0.3 available)
  code_builder 4.4.0 (4.5.0 available)
  collection 1.17.2 (1.18.0 available)
  connectivity_plus 4.0.1 (4.0.2 available)
  crypto 3.0.2 (3.0.3 available)
  csslib 0.17.2 (1.0.0 available)
  dart_style 2.2.4 (2.3.2 available)
  dartx 1.1.0 (1.2.0 available)
  dots_indicator 2.1.0 (3.0.0 available)
  duration 3.0.12 (3.0.13 available)
  ffi 2.0.2 (2.1.0 available)
  file 6.1.4 (7.0.0 available)
  file_picker 5.3.0 (5.3.3 available)
  fluentui_system_icons 1.1.190 (1.1.210 available)
  flutter_app_builder 0.0.9 (0.3.4 available)
  flutter_app_packager 0.0.9 (0.3.4 available)
  flutter_cache_manager 3.3.0 (3.3.1 available)
  flutter_distributor 0.0.2 (0.3.4 available)
  flutter_gen_core 5.2.0 (5.3.1 available)
  flutter_gen_runner 5.2.0 (5.3.1 available)
! flutter_hooks 0.20.0 (overridden)
  flutter_lints 2.0.1 (2.0.2 available)
  flutter_mailer 2.0.2 (2.1.1 available)
  flutter_native_splash 2.2.19 (2.3.2 available)
  flutter_plugin_android_lifecycle 2.0.14 (2.0.15 available)
  flutter_riverpod 2.1.3 (2.3.7 available)
  flutter_rust_bridge 1.80.1 (1.81.0 available)
  flutter_svg 1.1.6 (2.0.7 available)
  fluttertoast 8.1.3 (8.2.2 available)
  freezed_annotation 2.2.0 (2.4.1 available)
  fuzzywuzzy 0.2.0 (1.1.6 available)
  glob 2.1.1 (2.1.2 available)
  go_router 10.0.0 (10.1.0 available)
  graphs 2.2.0 (2.3.1 available)
  gsettings 0.2.7 (0.2.8 available)
  hive_generator 2.0.0 (2.0.1 available)
  hooks_riverpod 2.1.3 (2.3.8 available)
  html 0.15.3 (0.15.4 available)
! http 1.1.0 (overridden)
  introduction_screen 3.1.4 (3.1.11 available)
  json_serializable 6.6.2 (6.7.1 available)
  lints 2.0.1 (2.1.1 available)
  logger 1.1.0 (2.0.1 available)
  logging 1.1.1 (1.2.0 available)
  mailer 6.0.0 (6.0.1 available)
  material_color_utilities 0.5.0 (0.8.0 available)
  media_kit 1.1.3+1 (1.1.4+1 available)
  media_kit_libs_android_audio 1.3.1 (1.3.2 available)
  media_kit_libs_ios_audio 1.1.2 (1.1.3 available)
  media_kit_libs_linux 1.1.0 (1.1.1 available)
  media_kit_libs_macos_audio 1.1.2 (1.1.3 available)
  media_kit_libs_windows_audio 1.0.6 (1.0.7 available)
  oauth2 2.0.1 (2.0.2 available)
  path_provider 2.0.12 (2.1.0 available)
  path_provider_android 2.0.22 (2.1.0 available)
  path_provider_foundation 2.1.1 (2.3.0 available)
  path_provider_linux 2.1.7 (2.2.0 available)
  path_provider_platform_interface 2.0.5 (2.1.0 available)
  path_provider_windows 2.1.6 (2.2.0 available)
  permission_handler 10.2.0 (10.4.3 available)
  permission_handler_android 10.2.0 (10.3.3 available)
  permission_handler_apple 9.0.7 (9.1.4 available)
  permission_handler_platform_interface 3.9.0 (3.11.3 available)
  permission_handler_windows 0.1.2 (0.1.3 available)
  petitparser 5.1.0 (6.0.0 available)
  platform 3.1.0 (3.1.1 available)
  plugin_platform_interface 2.1.4 (2.1.5 available)
  popover 0.2.8+1 (0.2.8+2 available)
  postgrest 1.4.0 (1.5.0 available)
  process 4.2.4 (5.0.0 available)
  pub_api_client 2.4.0 (2.6.0 available)
  pub_semver 2.1.3 (2.1.4 available)
  pubspec_parse 1.2.2 (1.2.3 available)
  realtime_client 1.1.3 (1.2.0 available)
  retry 3.1.1 (3.1.2 available)
  riverpod 2.1.3 (2.3.7 available)
  sentry 7.5.2 (7.9.0 available)
  shared_preferences 2.1.0 (2.2.0 available)
  shared_preferences_android 2.1.0 (2.2.0 available)
  shared_preferences_foundation 2.2.0 (2.3.3 available)
  shared_preferences_linux 2.2.0 (2.3.0 available)
  shared_preferences_platform_interface 2.2.0 (2.3.0 available)
  shared_preferences_web 2.1.0 (2.2.0 available)
  shared_preferences_windows 2.2.0 (2.3.0 available)
  shelf 1.4.0 (1.4.1 available)
  shelf_static 1.1.1 (1.1.2 available)
  shelf_web_socket 1.0.3 (1.0.4 available)
  sidebarx 0.15.0 (0.16.1 available)
  source_helper 1.3.3 (1.3.4 available)
  sqflite 2.2.4+1 (2.3.0 available)
  sqflite_common 2.4.2+2 (2.5.0 available)
  stack_trace 1.11.0 (1.11.1 available)
  state_notifier 0.7.2+1 (1.0.0 available)
  stream_channel 2.1.1 (2.1.2 available)
  supabase 1.9.9 (1.11.0 available)
  system_theme 2.1.0 (2.3.1 available)
  system_tray 2.0.2 (2.0.3 available)
  test_api 0.6.0 (0.6.1 available)
  tuple 2.0.1 (2.0.2 available)
  typed_data 1.3.1 (1.3.2 available)
  universal_io 2.2.0 (2.2.2 available)
  url_launcher 6.1.9 (6.1.12 available)
  url_launcher_android 6.0.23 (6.0.38 available)
  url_launcher_ios 6.1.0 (6.1.4 available)
  url_launcher_linux 3.0.2 (3.0.5 available)
  url_launcher_macos 3.0.2 (3.0.6 available)
  url_launcher_platform_interface 2.1.1 (2.1.3 available)
  url_launcher_web 2.0.14 (2.0.18 available)
  url_launcher_windows 3.0.3 (3.0.7 available)
  visibility_detector 0.3.3 (0.4.0+2 available)
  vm_service 11.7.1 (11.9.0 available)
  watcher 1.0.2 (1.1.0 available)
  web_socket_channel 2.3.0 (2.4.0 available)
  win32 4.1.4 (5.0.6 available)
  win32_registry 1.1.0 (1.1.1 available)
  window_manager 0.3.1 (0.3.5 available)
  xdg_directories 0.2.0+3 (1.0.2 available)
  xml 6.2.2 (6.4.0 available)
  yaml 3.1.1 (3.1.2 available)
  youtube_explode_dart 2.0.1 (2.0.2 available)
Got dependencies!
Building package executable...
Failed to build build_runner:build_runner:
../../.pub-cache/hosted/pub.dev/watcher-1.0.2/lib/src/constructable_file_system_event.dart:7:57: Error: The class 'FileSystemEvent' can't be extended, implemented, or mixed in outside of its library because it's a sealed class.
abstract class _ConstructableFileSystemEvent implements FileSystemEvent {
                                                        ^
Failed to build build_runner:build_runner:
../../.pub-cache/hosted/pub.dev/watcher-1.0.2/lib/src/constructable_file_system_event.dart:7:57: Error: The class 'FileSystemEvent' can't be extended, implemented, or mixed in outside of its library because it's a sealed class.
abstract class _ConstructableFileSystemEvent implements FileSystemEvent {
                                                        ^
'patterns' is now enabled by default; this flag is no longer required.
'records' is now enabled by default; this flag is no longer required.

Then if i run the flutter run -d linux command I have the following output:

Launching lib/main.dart on Linux in debug mode...
Building Linux application...
ERROR: lib/collections/env.dart:3:6: Error: Error when reading 'lib/collections/env.g.dart': No such file or directory
ERROR: part 'env.g.dart';
ERROR:      ^
ERROR: lib/collections/env.dart:3:6: Error: Can't use 'lib/collections/env.g.dart' as a part, because it has no 'part of' declaration.
ERROR: part 'env.g.dart';
ERROR:      ^
ERROR: lib/collections/env.dart:14:33: Error: Undefined name '_Env'.
ERROR:   static final spotifySecrets = _Env.spotifySecrets.split(',').map((e) {
ERROR:                                 ^^^^
ERROR: lib/collections/env.dart:8:30: Error: Undefined name '_Env'.
ERROR:   static final supabaseUrl = _Env.supabaseUrl;
ERROR:                              ^^^^
ERROR: lib/collections/env.dart:11:34: Error: Undefined name '_Env'.
ERROR:   static final supabaseAnonKey = _Env.supabaseAnonKey;
ERROR:                                  ^^^^
ERROR: lib/collections/env.dart:23:39: Error: Undefined name '_Env'.
ERROR:   static final _enableUpdateChecker = _Env._enableUpdateChecker;
ERROR:                                       ^^^^
ERROR: ../../.pub-cache/hosted/pub.dev/skeleton_text-3.0.0/lib/skeleton_text.dart:70:49: Error: The argument type 'BorderRadius?' can't be assigned to the parameter type 'BorderRadiusGeometry' because 'BorderRadius?' is nullable and 'BorderRadiusGeometry' isn't.
ERROR:  - 'BorderRadius' is from 'package:flutter/src/painting/border_radius.dart' ('/opt/flutter/packages/flutter/lib/src/painting/border_radius.dart').
ERROR:  - 'BorderRadiusGeometry' is from 'package:flutter/src/painting/border_radius.dart' ('/opt/flutter/packages/flutter/lib/src/painting/border_radius.dart').
ERROR:               borderRadius: widget.borderRadius as BorderRadius?,
ERROR:                                                 ^
ERROR: Target kernel_snapshot failed: Exception
Exception: Build process failed

[KRTirtho]

You missed the step

Create a .env in root of the project following the .env.example template

[ncvescera]

Oh sorry, I forgot to mention that.

I made a .env file following the .env.template template.
I have something like this:

SUPABASE_URL=
SUPABASE_API_KEY=

#            my client ID:my secret key
SPOTIFY_SECRETS=012345...:12349gi390...

# 0 or 1
# 0 = disable
# 1 = enable
ENABLE_UPDATE_CHECK=0

I left the supabase fields empty. Should I fill them too ?

[KRTirtho]

No supabase fields are optional
Please make sure to use exactly Flutter 3.10.* as Flutter 3.13 isn't still supported

[ncvescera]

Thanks, downgrade Flutter to 3.10.7 fixed the problem 🚀