Flutter: Unimplemented handling of missing static target

Question

I am running my first Flutter project
I created a sample project and I was able to run the app in simulator

I have edited the file main.dart

main.dart

import 'package:flutter/material.dart';

void main() => runApp(MaterialApp(home: Text('Hello World')));

Now I am getting the error :

pubspec.yaml

name: flutter_app
description: A new Flutter application.

# 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.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1

environment:
  sdk: ">=2.1.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2

dev_dependencies:
  flutter_test:
    sdk: flutter


# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/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:
  #  - images/a_dot_burr.jpeg
  #  - images/a_dot_ham.jpeg

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

  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/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: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages

I think you have to put your text in stateful or stateless class — Hardik Kumbhani, Sep 23 '19 at 04:02
@HardikKumbhani ... How to do that ! ... I am new to flutter and this is the first file i am working — Devrath, Sep 23 '19 at 04:03
where is your boiler plate code whenever we created new project? — Hardik Kumbhani, Sep 23 '19 at 04:06
https://github.com/hardik584/Flutter-lunchbox/blob/master/Devrath.dart please use this code — Hardik Kumbhani, Sep 23 '19 at 04:10
I had the same problem in another situation. What I did was simply switch to StatefulWidget and a HotRestart =) — Edeson Bizerril, Jul 30 '20 at 14:37

score 397 · Answer 1 · edited Jul 02 '21 at 21:57

397

The same error occurred for me at first ... but it worked when I did a 'hot restart'

edited Jul 02 '21 at 21:57

MendelG

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answered Oct 25 '19 at 11:20

Hitesh Pandey

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11

Worked for me, too. For everyone like me, who's not that familiar: The shortcut is CTRL+SHIFT+\ or just click the button with the green circle-arrow in the console-window - it will re-sync files to the device. – n.r. Nov 13 '19 at 09:00
5

Worked for me too. This should be the accepted answer – Megha Maniar Jul 17 '20 at 07:10
15

flutter tip: when there is an error, assume there is none, first restart – larsaars Nov 15 '20 at 23:34
3

just stop the run app and start again – Em.MF Nov 25 '21 at 21:09
Thanks! Just had an heart attack because of this haha – SwiftiSwift Feb 26 '23 at 08:23
thanks, as simple as hot restart solved the problem :) – geniusvale Apr 25 '23 at 05:33

score 95 · Answer 2 · answered Oct 23 '19 at 20:07

Just compile the project again and it will work. The error occurs because static variables are hard compiled on the executable and are not dynamic. If you hot reload the changes, it will not rebuild the executable (apk), so that's why you need to rebuild the app.

Joshua Craven · Accepted Answer · 2021-07-19T00:19:44.910

82

Your code works for me...

Have you tried a hot restart? The shortcut is CTRL+SHIFT+\ or just click the button with the green circle-arrow in the console-window

I'm not sure what that error is, since I can't replicate it. However, this is more like what your app should look like. Give this a shot and see if it works.

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Text('Hello World'),
    );
  }
}

edited Jul 19 '21 at 00:19

answered Sep 23 '19 at 04:11

Joshua Craven

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Do we need to use the `StatelessWidget` compulsorily ? – Devrath Sep 23 '19 at 04:15
1

Ya man build method is compulsory for rendering your ui screen and you can found build method inside stateless or stateful widget – Hardik Kumbhani Sep 23 '19 at 04:23
1

I had the same problem and your code also worked for me. – Pete Alvin Oct 25 '19 at 18:24
You don't need StatelessWidget, but you do need something that can invoke MediaQuery.of That can be easily implemented by implementing `MaterialApp()` at the top of your widget tree. – KoalaZub May 29 '20 at 14:49
This answer is better for beginners: https://stackoverflow.com/a/58557571/9636037 – Abhimanyu Dec 10 '20 at 06:03
It happens when you completely update the app class (in your case "MyApp"). So the hot reload doesn't work and you need to rebuild and rerun the project. – Moosa Baloch Jan 30 '21 at 18:46
Can the `home:` really be just a `Text()` widget...? Shouldn't it be a screen, with a `Scaffold()` and stuff in it...? – Karolina Hagegård May 13 '22 at 15:44

score 36 · Answer 4 · edited Mar 03 '20 at 13:32

36

Just delete the build and recompile. It worked for me. Use the following code:

flutter clean
flutter run

edited Mar 03 '20 at 13:32

Tamir Abutbul

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answered Dec 17 '19 at 16:18

Kalana Mihiranga

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am sorry but isnt this killing a mosquito with AK-47? Seems like a very long way to go for a restart – emanuel sanga Nov 26 '20 at 23:33
Sometimes hot reload wont fix the problem. – Kalana Mihiranga Nov 27 '20 at 12:34
Ahaa, but a person should start with reloading first.. – emanuel sanga Nov 28 '20 at 08:25

score 23 · Answer 5 · answered May 02 '20 at 23:14

23

Usually, a Full App Restart is required after a heavy logic change, as transforming a StatelessWidget into StatefulWidget. Check André Glatzl answer

In Android Studio use the Flutter Hot Restart

answered May 02 '20 at 23:14

dianakarenms

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score 9 · Answer 6 · answered Aug 06 '20 at 23:08

A hot restart will work. But the source of the problem might be as follows.

You've created new project. You've deleted boilerplate code and try to modify without a stateful or stateless widget. Flutter tries to rebuild widgets under build() method. But when you hot reload, flutter might not resolve what you've updated.

Another example of such error is, when we create a new static variable(static String token = "abc";) in one Class (like constants.dart) and try to reference them in another screen (constants.token), flutter failed to resolve such static things when we hotreload. but it work fine when we hotrestart.

Jananath Banuka · Answer 7 · 2020-04-29T08:09:22.970

7

One of the reasons this happens is you are running the app for the first time and then you make some changes and reload again. Without reloading, stop the execution, and again run the app from scratch, this error won't come.

edited Apr 29 '20 at 08:09

answered Mar 13 '20 at 17:26

Jananath Banuka

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score 6 · Answer 8 · answered May 17 '22 at 10:02

6

I also faced the same situation, I fixed it by running the app again, This issue is caused when you applied a lot of change to your code and pressed the hot reload button.

answered May 17 '22 at 10:02

Emmanuel Ametepee

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score 5 · Answer 9 · answered May 04 '21 at 07:32

5

Restarting the app worked in my case.

answered May 04 '21 at 07:32

Naimur Hasan

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score 3 · Answer 10 · answered Oct 31 '19 at 10:54

3

Run this command again

'flutter run'

should work

answered Oct 31 '19 at 10:54

Twitter khuong291

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score 3 · Answer 11 · answered Nov 29 '19 at 08:02

3

You changed the myApp and created your own MaterialApp so all you have to do is after changing the name into MaterialApp instead of hot restart click the play button. It will work. Thanks

answered Nov 29 '19 at 08:02

Ghanashyam

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score 3 · Answer 12 · answered May 28 '20 at 16:40

3

Just press the red stop button and click the play button again. It will work :)

answered May 28 '20 at 16:40

Mano Haran

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score 2 · Answer 13 · edited Mar 08 '23 at 05:23

2

If you have added a Hot Reloading extension then exit and try restarting the Hot Reloading.

It should work.

edited Mar 08 '23 at 05:23

Hamed

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answered Sep 06 '22 at 12:02

Ignatius Andrew

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score 1 · Answer 14 · answered Jul 02 '21 at 22:07

1

As other answers mention, you can 'hot reload' or rebuild your app to solve this issue.

But the reason why I got this error, was that I have edited the pubspec.yaml file, when editing the pubspec.yaml file, you should stop and rebuild the entire app.

answered Jul 02 '21 at 22:07

MendelG

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Lamech Desai · Answer 15 · 2022-05-09T08:49:39.407

Navigate to your lib folder where your main.dart file is and run the commands below:

PS C:\Users\mobile_app\lib> flutter clean

PS C:\Users\mobile_app\lib> flutter pub get

PS C:\Users\mobile_app\lib> flutter run

although if you are having null safety issues I would prefer you debug your application first. In my encounters this error is of a result of trying to run a class component outside a the Static Widget with context hence the class is loaded before build time making the application fail to start.

score 1 · Answer 16 · answered Aug 21 '22 at 17:22

I occurred when I was implementing TextEditingController and there after I created a function which has parameter inside, so when I wrote the addListener for the controller, then below error got occurred,

Unimplemented handling of missing static target flutter

but after removing the argument from the addListener function still the issue persists and which broked my application, even I did the hot reload in my Android Studio.

Solution:
Mostly similar to above said, but little different, I terminated my app, and rerun the app, and which fixed the issue.

Hope this would help manyone.

score 0 · Answer 17 · answered Jul 01 '20 at 06:14

0

Check your import. It should be import 'package:your_app...' not import 'file://C/path/your_app/

answered Jul 01 '20 at 06:14

TSR

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score 0 · Answer 18 · edited Mar 08 '23 at 05:19

0

Update 2023.

flutter clean
flutter packages get
flutter run

edited Mar 08 '23 at 05:19

4b0

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answered Mar 08 '23 at 03:09

daryl

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Flutter: Unimplemented handling of missing static target

18 Answers18