问设置UnsupportedError时引发的localizationsDelegates

EN

Exception has occurred.
UnsupportedError (Unsupported operation: Cannot modify unmodifiable map)

Exception has occurred.
FlutterError (No MaterialLocalizations found.
TabBar widgets require MaterialLocalizations to be provided by a Localizations widget ancestor.
The material library uses Localizations to generate messages, labels, and abbreviations.
To introduce a MaterialLocalizations, either use a MaterialApp at the root of your application to include them automatically, or add a Localization widget with a MaterialLocalizations delegate.
The specific widget that could not find a MaterialLocalizations ancestor was:
  TabBar

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  await Get.putAsync(() => EnvService().init());
  await Get.putAsync(() => IntlService().init());

  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return GetMaterialApp(
      title: "MyApp",
      initialRoute: AppPages.INITIAL,
      getPages: AppPages.routes,
      themeMode: ThemeMode.dark,
      theme: MyAppTheme.light,
      darkTheme: MyAppTheme.dark,
      debugShowCheckedModeBanner: false,
      // translations: AppTranslations(),
      locale: const Locale('en', 'US'),
      fallbackLocale: const Locale('id', 'ID'),
      supportedLocales: const [
        Locale('en', 'US'),
        Locale('id', 'ID'),
      ],
      //
      //
      // UNCOMMENT THIS LINE, YOUR PHONE WILL EXPLODE!
      // localizationsDelegates: GlobalMaterialLocalizations.delegates,
    );
  }
}

class EnvService extends GetxService {
  static EnvService get instance => Get.find();

  Future<EnvService> init() async {
    await dotenv.load();
    return this;
  }

  Locale get defaultLocale {
    final locale = dotenv.get('DEFAULT_LOCALE', fallback: 'id');
    
    if (locale != 'id') {
      return const Locale('en', 'US');
    }
    
    return Locale(locale, locale.toUpperCase());
  }
}

class IntlService extends GetxService {
  static IntlService get instance => Get.find();

  Locale get _locale {
    return Get.locale ?? EnvService.instance.defaultLocale;
  }

  Future<IntlService> init() async {
    await initializeDateFormatting(_locale.countryCode);
    return this;
  }

  String formatCurrency(double number) {
    final formatter = NumberFormat.simpleCurrency(decimalDigits: 0);
    return formatter.format(number);
  }

  String formatDate(DateTime? dateTime, [String? format]) {
    if (dateTime == null) {
      return '';
    }
    return DateFormat(format).format(dateTime);
  }
}