'Target of URI doesn't exist: 'package:flutter_gen/gen_l10n/gallery_localizations.dart'

I am now using flutter gallary in my project, this is the package reference:

import 'package:flutter_gen/gen_l10n/gallery_localizations.dart';

but it shows:

Target of URI doesn't exist: 'package:flutter_gen/gen_l10n/gallery_localizations.dart'.

I added lib in pubspec.yaml:

flutter_localizations:
    sdk: flutter
intl: ^0.16.1
flutter_localized_locales: ^1.1.1

and added l10n.yaml:

template-arb-file: intl_en.arb
output-localization-file: gallery_localizations.dart
output-class: GalleryLocalizations
preferred-supported-locales:
  - en
use-deferred-loading: false

Am I missing something? still not work, what should I do to make it work? This is the full code:

import 'package:flutter/material.dart';
import 'package:animations/animations.dart';
import 'package:flutter_gen/gen_l10n/gallery_localizations.dart';

enum BottomNavigationDemoType {
  withLabels,
  withoutLabels,
}

class BottomNavigationDemo extends StatefulWidget {
  const BottomNavigationDemo({Key key, @required this.type}) : super(key: key);

  final BottomNavigationDemoType type;

  @override
  _BottomNavigationDemoState createState() => _BottomNavigationDemoState();
}

class _BottomNavigationDemoState extends State<BottomNavigationDemo> {
  int _currentIndex = 0;

  String _title(BuildContext context) {
    switch (widget.type) {
      case BottomNavigationDemoType.withLabels:
        return GalleryLocalizations.of(context)
            .demoBottomNavigationPersistentLabels;
      case BottomNavigationDemoType.withoutLabels:
        return GalleryLocalizations.of(context)
            .demoBottomNavigationSelectedLabel;
    }
    return '';
  }

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final textTheme = Theme.of(context).textTheme;

    var bottomNavigationBarItems = <BottomNavigationBarItem>[
      BottomNavigationBarItem(
        icon: const Icon(Icons.add_comment),
        label: GalleryLocalizations.of(context).bottomNavigationCommentsTab,
      ),
      BottomNavigationBarItem(
        icon: const Icon(Icons.calendar_today),
        label: GalleryLocalizations.of(context).bottomNavigationCalendarTab,
      ),
      BottomNavigationBarItem(
        icon: const Icon(Icons.account_circle),
        label: GalleryLocalizations.of(context).bottomNavigationAccountTab,
      ),
      BottomNavigationBarItem(
        icon: const Icon(Icons.alarm_on),
        label: GalleryLocalizations.of(context).bottomNavigationAlarmTab,
      ),
      BottomNavigationBarItem(
        icon: const Icon(Icons.camera_enhance),
        label: GalleryLocalizations.of(context).bottomNavigationCameraTab,
      ),
    ];

    if (widget.type == BottomNavigationDemoType.withLabels) {
      bottomNavigationBarItems = bottomNavigationBarItems.sublist(
          0, bottomNavigationBarItems.length - 2);
      _currentIndex =
          _currentIndex.clamp(0, bottomNavigationBarItems.length - 1).toInt();
    }

    return Scaffold(
      appBar: AppBar(
        automaticallyImplyLeading: false,
        title: Text(_title(context)),
      ),
      body: Center(
        child: PageTransitionSwitcher(
          child: _NavigationDestinationView(
            // Adding [UniqueKey] to make sure the widget rebuilds when transitioning.
            key: UniqueKey(),
            item: bottomNavigationBarItems[_currentIndex],
          ),
          transitionBuilder: (child, animation, secondaryAnimation) {
            return FadeThroughTransition(
              child: child,
              animation: animation,
              secondaryAnimation: secondaryAnimation,
            );
          },
        ),
      ),
      bottomNavigationBar: BottomNavigationBar(
        showUnselectedLabels:
        widget.type == BottomNavigationDemoType.withLabels,
        items: bottomNavigationBarItems,
        currentIndex: _currentIndex,
        type: BottomNavigationBarType.fixed,
        selectedFontSize: textTheme.caption.fontSize,
        unselectedFontSize: textTheme.caption.fontSize,
        onTap: (index) {
          setState(() {
            _currentIndex = index;
          });
        },
        selectedItemColor: colorScheme.onPrimary,
        unselectedItemColor: colorScheme.onPrimary.withOpacity(0.38),
        backgroundColor: colorScheme.primary,
      ),
    );
  }
}

class _NavigationDestinationView extends StatelessWidget {
  _NavigationDestinationView({Key key, this.item}) : super(key: key);

  final BottomNavigationBarItem item;

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        ExcludeSemantics(
          child: Center(
            child: Padding(
              padding: const EdgeInsets.all(16),
              child: ClipRRect(
                borderRadius: BorderRadius.circular(8),
                child: Image.asset(
                  'assets/demos/bottom_navigation_background.png',
                  package: 'flutter_gallery_assets',
                ),
              ),
            ),
          ),
        ),
        Center(
          child: IconTheme(
            data: const IconThemeData(
              color: Colors.white,
              size: 80,
            ),
            child: Semantics(
              label: GalleryLocalizations.of(context)
                  .bottomNavigationContentPlaceholder(
                item.label,
              ),
              child: item.icon,
            ),
          ),
        ),
      ],
    );
  }
}

when I run the command flutter clean && flutter run , shows the result:

[dolphin@MiWiFi-R4CM-srv]~/AndroidStudioProjects/Cruise% flutter clean && flutter run 
Attempted to generate localizations code without having the flutter: generate flag turned on.
Check pubspec.yaml and ensure that flutter: generate: true has been added and rebuild the project. Otherwise, the localizations source code will not be
importable.
Generating synthetic localizations package has failed.

flutter

Solution 1:^[1]

I followed the Flutter official doc (https://flutter.dev/docs/development/accessibility-and-localization/internationalization) but came across the same problem as you. I first tried "flutter upgrade". The issue still remained.

After that, I tried to close my IDE(Android studio) and open it again, and the issue was cleared!

Solution 2:^[2]

Additionally to @Sleepingisimportant answer's, you can restart "Dart Analysis Server" and the issue will be resolved.

This button is in the Dart Analysis Tab here on Android Studio which I guess means it's also on Intelij.

Solution 3:^[3]

I had the same problem, I just closed and opened my folder again, I'm using vs code.

Solution 4:^[4]

View > Command Palette and then typing Dart: Restart Analysis Server.

Solution 5:^[5]

Try to run flutter update-packages in ~/flutter/packages/flutter.

flutter update-packages

Or update the Flutter SDK by using the flutter upgrade command:

flutter upgrade

This command gets the most recent version of the Flutter SDK that’s available on your current Flutter channel.

More information on how to upgrad the Flutter SDK or switching Flutter channels : https://flutter.dev/docs/development/tools/sdk/upgrading

This will fix your import 'package:flutter_gen/gen_l10n/gallery_localizations.dart'; issue.

Solution 6:^[6]

I just solved it after adding l10n.yaml, then did this:

restart your project
Run:

flutter clean

flutter pub get

Solution 7:^[7]

At the bottom of our pubspec.yaml you should set generate to true...

# 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
  generate: true

Solution 8:^[8]

I faced the same issue and what I did was I ran flutter clean command first in the terminal. After that I ran the flutter by flutter run command again. It worked.

Solution 9:^[9]

If you are using a package flutter_gen you need to remove it from pubscpec.yaml to resolve conflict.

Solution 10:^[10]

flutter pub get could also help if this has not already been done. This is important after adding new stuff to pubspec.yaml

Solution 11:^[11]

You might need to close and reopen your IDE so it re-analyses your code base. VS Code in particular sometimes doesn't recognise changes to the code base but closing and reopening your IDE will trigger a re-index / analysis of your code and should resolve this phantom error.

Solution 12:^[12]

Add new line at every arb files. E.g. into l10n/app_en.arb. Then click Pub get.

Solution 13:^[13]

Please add generate: true in the bottom of flutter section. After that. Restart your editor or IDE tool. Run flutter clean and flutter pub get.

environment:
dependencies:
flutter:
  uses-material-design: true
  generate: true

Solution 14:^[14]

If someone open existing project with Localisation already added. This error always comes. import 'package:flutter_gen/gen_l10n/app_localizations.dart'; not exist

So run this command in terminal : flutter pub add flutter_gen

Solution 15:^[15]

If you'r using VSCode, simply click "Shift+CMD+P" then "Dart: Restart Analysis Server"

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Sleepingisimportant
Solution 2	Shams M.Monem
Solution 3	Rodrigo Pedroso
Solution 4	Faisal Mulya
Solution 5	Erik Saunier
Solution 6
Solution 7	Ed Manners
Solution 8	ZygD
Solution 9	t-geh
Solution 10	Luca_54
Solution 11	James Skilton
Solution 12	Evgen
Solution 13
Solution 14	SHUBHAM YEOLE
Solution 15	alaasdk

'Target of URI doesn't exist: 'package:flutter_gen/gen_l10n/gallery_localizations.dart'

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