flutter_news_template various issues during flutter run

[Piinks]

Original: https://github.com/flutter/flutter/issues/170982

---

#hey I successfully generated a project using mason , I did according to https://flutter.github.io/news_toolkit/ including Firebase setup (but NOT ads, notifications and others).

• The First issue "Error (Xcode): Error: Couldn't resolve the package 'flutter_gen'" in package:flutter_gen/gen_l10n/app_localizations.dart'.

I found a way how to bypass it just wanted to run the project, I changed imports in I10n.dart

import 'generated/app_localizations.dart';
import 'package:flutter/widgets.dart';
export 'generated/app_localizations.dart';

extension AppLocalizationsX on BuildContext {
  AppLocalizations get l10n => AppLocalizations.of(this);
}

and modify the I10n.yaml

template-arb-file: app_en.arb
output-localization-file: app_localizations.dart
nullable-getter: false
synthetic-package: false
output-dir: lib/l10n/generated

• the second

on IOS Lexical or Preprocessor Issue (Xcode): 'FirebaseAuth/FirebaseAuth-Swift.h' file not found , as well as FirebaseMessaging h ...

on Android

/.pub-cache/hosted/pub.dev/webview_flutter_android-3.16.0/android/src/main/java/io/flutter/plugins/webviewflutter/FlutterAssetManager.java:61: error: cannot find symbol
    final PluginRegistry.Registrar registrar;
                        ^
  symbol:   class Registrar
  location: interface PluginRegistry
/Users/kosmos/.pub-cache/hosted/pub.dev/webview_flutter_android-3.16.0/android/src/main/java/io/flutter/plugins/webviewflutter/FlutterAssetManager.java:71: error: cannot find symbol
    RegistrarFlutterAssetManager(AssetManager assetManager, PluginRegistry.Registrar registrar) {
                                                                          ^
  symbol:   class Registrar
  location: interface PluginRegistry
/Users/kosmos/.pub-cache/hosted/pub.dev/webview_flutter_android-3.16.0/android/src/main/java/io/flutter/plugins/webviewflutter/WebViewFlutterPlugin.java:70: error: cannot find symbol
      @NonNull io.flutter.plugin.common.PluginRegistry.Registrar registrar) {
                                                      ^
  symbol:   class Registrar
  location: interface PluginRegistry

• third issue in the app_theme.dart:32 The argument type 'TabBarTheme' can't be assigned to the parameter type 'TabBarThemeData?'.

flutter doctor:

Flutter (Channel stable, 3.32.2, on macOS 15.5 24F74 darwin-arm64, locale
    en-IL) [298ms]
    • Flutter version 3.32.2 on channel stable at
      /opt/homebrew/Caskroom/flutter/3.29.0/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 8defaa71a7 (3 weeks ago), 2025-06-04 11:02:51 -0700
    • Engine revision 1091508939
    • Dart version 3.8.1
    • DevTools version 2.45.1

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    [3.8s]
    • Android SDK at /Users/kosmos/Library/Android/sdk
    • Platform android-35, build-tools 34.0.0
    • Java binary at: /Applications/Android
      Studio.app/Contents/jbr/Contents/Home/bin/java
      This is the JDK bundled with the latest Android Studio installation on
      this machine.
      To manually set the JDK path, use: `flutter config
      --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build
      17.0.6+0-17.0.6b829.9-10027231)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.4) [632ms]
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 16F6
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web [7ms]
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.3) [7ms]
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build
      17.0.6+0-17.0.6b829.9-10027231)

[✓] VS Code (version 1.101.1) [5ms]
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.112.0