'FlutterError: Unable to load asset

This is the folder structure of my app

.idea
.vscode
android
build
fonts
 Oxygen-Bold.tff
 Oxygen-Light.tff
 Oxygen-Regular.tff
images
 pizza0.png
 pizza1.png
ios
lib
 ui
  home.dart
 main.dart
test
.gitignore
.metadata
.packages
app_widgets.iml
pubspec.lock
pubspec.yaml
README.md

In my pubspec.yaml file, I load the fonts and assets like this

flutter:

uses-material-design: true

assets:
  - images/pizza0.png
  - images/pizza1.png

fonts:
  - family: Oxygen
    fonts:
      - asset: fonts/Oxygen-Regular.ttf
      - asset: fonts/Oxygen-Bold.ttf
        weight: 700
      - asset: fonts/Oxygen-Light.ttf
        weight: 300

I'm not getting any errors for this pubspec.yaml, and running flutter packages get gives an exit code of 0.

In my home.dart I have the following class:

class PizzaImageWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    AssetImage pizzaAsset = AssetImage('images/pizza0.png');
    Image image = Image(image: pizzaAsset, width: 400, height: 400);
    return Container(
      child: image,
    );
  }
}

Which I use elsewhere, in order to show the image (code omitted):

        ),
        PizzaImageWidget(),
      ],

The building gives no errors. Flutter Doctor -v doesn't give any errors, neither does Flutter Analyze -v. The .apk seems to build just fine but when the app opens up on my phone I get the following error in asset_bundle.dart:

Exception has occurred. FlutterError (Unable to load asset: images/pizza0.png)

The error is thrown by this class in the asset_bundle.dart file:

/// An [AssetBundle] that loads resources using platform messages.
class PlatformAssetBundle extends CachingAssetBundle {
  @override
  Future<ByteData> load(String key) async {
    final Uint8List encoded = utf8.encoder.convert(Uri(path: Uri.encodeFull(key)).path);
    final ByteData asset =
        await BinaryMessages.send('flutter/assets', encoded.buffer.asByteData());
    if (asset == null)
      throw FlutterError('Unable to load asset: $key');
    return asset;
  }
}

This happens both for the pizza0.png file as well as the pizza1.png file. The files are visible in the tree structure, both in Windows Explorer as in VS Code. The font assets load without issue.

This is the output I am getting when running Flutter Run -v:

[+1068 ms] I/flutter ( 6489): ══╡ EXCEPTION CAUGHT BY IMAGE RESOURCE SERVICE ╞════════════════════════════════════════════════════ [ +9 ms] I/flutter ( 6489): The following assertion was thrown resolving an image codec: [ +2 ms] I/flutter ( 6489): Unable to load asset: images/pizza0.png [ +2 ms] I/flutter ( 6489): [ +1 ms] I/flutter ( 6489): When the exception was thrown, this was the stack: [ +2 ms] I/flutter ( 6489): #0 PlatformAssetBundle.load (package:flutter/src/services/asset_bundle.dart:221:7) [ +1 ms] I/flutter ( 6489): [ +1 ms] I/flutter ( 6489): #1 AssetBundleImageProvider._loadAsync (package:flutter/src/painting/image_provider.dart:429:44) [ +1 ms] I/flutter ( 6489): [ +1 ms] I/flutter ( 6489): #2 AssetBundleImageProvider.load (package:flutter/src/painting/image_provider.dart:414:14) [ +1 ms] I/flutter ( 6489): #3 ImageProvider.resolve.. (package:flutter/src/painting/image_provider.dart:267:86) [ +4 ms] I/flutter ( 6489): #4 ImageCache.putIfAbsent (package:flutter/src/painting/image_cache.dart:143:20) [ +3 ms] I/flutter ( 6489): #5 ImageProvider.resolve. (package:flutter/src/painting/image_provider.dart:267:63) [ +3 ms] I/flutter ( 6489): (elided 8 frames from package dart:async) [ +1 ms] I/flutter ( 6489): [ +1 ms] I/flutter ( 6489): Image provider: AssetImage(bundle: null, name: "images/pizza0.png") [ +3 ms] I/flutter ( 6489): Image key: AssetBundleImageKey(bundle: PlatformAssetBundle#20fc8(), name: "images/pizza0.png", [ +1 ms] I/flutter ( 6489): scale: 1.0) [ +2 ms] I/flutter ( 6489): ════════════════════════════════════════════════════════════════════════════════════════════════════

flutter assets

Solution 1:^[1]

You should consider the indentation for assets

flutter:

  assets:
    - images/pizza1.png
    - images/pizza0.png

More details:

flutter:

[2 whitespaces or 1 tab]assets:
[4 whitespaces or 2 tabs]- images/pizza1.png
[4 whitespaces or 2 tabs]- images/pizza0.png

Solution 2:^[2]

I have the same issue. I've just run "$ flutter clean", then everything is OK.

More about this error

Solution 3:^[3]

The simplest way is to reference your assets folder instead of the asset itself, just make sure you use proper indentations as the pubspec.yaml is indent sensitive.

flutter:

  uses-material-design: true
  assets:
    - images/

and you can simply access each image as

  Image.asset('images/pizza1.png', width:300, height:100)

Solution 4:^[4]

For me,

flutter clean,
Restart the android studio and emulator,

giving full patth in my image

image: AssetImage(
  './lib/graphics/logo2.png'
   ),
   width: 200,
   height: 200,
 );

these three steps did the trick.

Solution 5:^[5]

Encountered the same issue with a slightly different code. In my case, I was using a "assets" folder subdivided into sub-folders for assets (sprites, audio, UI).

My code was simply at first in pubspec.yaml- alternative would be to detail every single file.

flutter:

  assets:
    - assets

Indentation and flutter clean was not enough to fix it. The files in the sub-folders were not loading by flutter. It seems like flutter needs to be "taken by the hand" and not looking at sub-folders without explicitly asking it to look at them. This worked for me:

flutter:

  assets:
    - assets/sprites/
    - assets/audio/
    - assets/UI/

So I had to detail each folder and each sub-folder that contains assets (mp3, jpg, etc). Doing so made the app work and saved me tons of time as the only solution detailed above would require me to manually list 30+ assets while the code here is just a few lines and easier to maintain.

Solution 6:^[6]

I also had this problem. I think there is a bug in the way Flutter caches images. My guess is that when you first attempted to load pizza0.png, it wasn't available, and Flutter has cached this failed result. Then, even after adding the correct image, Flutter still assumes it isn't available.

This is all guess-work, based on the fact that I had the same problem, and calling this once on app start fixed the problem for me:

imageCache.clear();

This clears the image cache, meaning that Flutter will then attempt to load the images fresh rather than search the cache.

PS I've also found that you need to call this whenever you change any existing images, for the same reason - Flutter will load the old cached version. The alternative is to rename the image.

Solution 7:^[7]

inside pubspec.yaml, DON'T USE TAB!

flutter:
<space><space>assets:
<space><space><space><space>assets/

example:

flutter:
  assets:
    assets/

Solution 8:^[8]

Actually the problem is in pubspec.yaml, I put all images to assets/images/ and

This wrong way

flutter:
  uses-material-design: true
  assets:
  - images/

Correct

flutter:
  uses-material-design: true
  assets:
  - assets/images/

Solution 9:^[9]

i just Re-run My app instead of just hot Reload.

Solution 10:^[10]

The causes of this error are as below.

1).Wrong indentation for assets in pubspec.yaml file.

2).Not given proper path.

3).Extra whitespace in pubspec.yaml file

To Solve

Flutter uses the pubspec.yaml file, located at the root of your project, to identify assets required by an app.

Your "assets" key should be underneath a flutter: key

Here is an example:

flutter:
  uses-material-design: true
  assets:
    - assets/my_icon.png
    - assets/background.png

If you have sub-directories in the assets folder, then To include all assets under a directory, specify the directory name with the / character at the end:

flutter:
  uses-material-design: true
  assets:
    - directory/
    - directory/subdirectory/

Be sure your structure not be like this

flutter:
  uses-material-design: true
assets:
   - images/xxx.png

For more info, see https://flutter.dev/docs/development/ui/assets-and-images

Solution 11:^[11]

I haved a similar problem, I fixed here:

uses-material-design: true
 assets:
   - assets/images/

After, do:

Flutter Clean

Solution 12:^[12]

if you're developing flutter packages, please add package param after image path like this:

AssetImage('images/heart.png', package: 'my_icons') // my_icons is your plugin name, in flutter plugin is also a package.

Here is the link from flutter docs https://flutter.dev/assets-and-images/#from-packages

Solution 13:^[13]

Some times cache will create a problem so first run

flutter clean

after this run

flutter pub get

Solution 14:^[14]

In my case a restart didn't help.

I had to uninstall the app and then run everything again.

It did worked!

Solution 15:^[15]

you should start image path with assets word:

image: AssetImage('assets/images/pizza0.png')

you must add each sub folder in a new line in pubspec.yaml

Solution 16:^[16]

After you did all things and still not working, try:

flutter clean
flutter pub get

sometimes after updating pubspec.yaml file, it can not run pub get although it shows it is running.

try commands above

Solution 17:^[17]

While I was loading a new image in my asset folder, I just encountered the problem every time.

I run flutter clean & then restarted the Android Studio. Seems like flutter packages caches the asset folder and there is no mechanism to update the cache when a developer adds a new image in the project (Personal thoughts).

Solution 18:^[18]

Make a habit to check pubspec.yaml when you are struggling to load an image in a Flutter project. Most of the time, the problem is with it.

The correct way is mentioned below. Do not use the Tab key to keep the spaces. Instead, use the Space bar.

flutter:
  uses-material-design: tru
  assets:
    - images/image1.jpg

And make sure you include the same correct path in your dart file.

One trick I always use is renaming the image with a very short name to avoid typo errors.

Hope this would be helpful to anyone who faces these kinds of problems.

Solution 19:^[19]

The only thing that worked for me to mention THE WHOLE PATH in the CODE. That is you must mention the image path from the root directory on the code page, in YAML it works with the top-level directory.

You probably can't get away only with the main directory path in code, I have tried a lot and that's the only thing that works.

hope it solved the issue and saved your time.

The 1st image is of code and the second is of the yaml.

Solution 20:^[20]

If everything is ok, correct path, correct pubspec spaces, etc, the last thing that could cause this is cache. You can close the simulator and start your application again, it helps for my case.

Solution 21:^[21]

This is issue has almost driven me nut in the past. To buttress what others have said, after making sure that all the indentations on the yaml file has been corrected and the problem persist, run a 'flutter clean' command at the terminal in Android studio. As at flutter 1.9, this should fix the issue.

Solution 22:^[22]

Another cause of similar problem: On Windows you should not use \ sign as directory separator. So

instead of

AssetImage('images\heart.png')

use

AssetImage('images/heart.png')

It can be a bug of Windows version of Flutter. It solved my problem.

Solution 23:^[23]

One more answer in the mix:

My pubspec.yaml looked like this:

flutter:
  assets:
    - assets/us_defs/
    - assets/eu_defs/
    - assets/images/

and in the invoking code:

Center(
  child: Image(
    image: AssetImage('assets/images/<name.png>')
  )
)

(The *_defs folders contain json files for various other purposes and I can load them just fine.)

But, the image wouldn't load, no matter what I tried. Checked and double checked the indent spacing, spelling, invoked flutter clean and flutter pub get, cold started the app, etc. Tried referencing 'images/<name.png>' vs 'assets/images/<name.png>'.

Nada.

Finally, I lifted the images folder to the top level under the project folder:

flutter:
  assets:
    - assets/us_defs/
    - assets/eu_defs/
    - images/    <-- now a top level folder

and in the invoking code:

Center(
  child: Image(
    image: AssetImage('images/<name.png>');
  )
)

... and that worked.

I have no idea why.

Now, I'd rather keep the images folder in assets since it fits my sensibilities, but if this reorg gets me going, I'll live with it.

Solution 24:^[24]

There is clearly some sort of flutter bug. This is my directory structure:

<project>/assets/images/myimage.png

This is what I have in pubspec.yaml:

flutter:

  uses-material-design: true
  assets:
    - assets/images/

And this is how it used to work and still works when I compile for web:

const DecorationImage(image: AssetImage("images/myimage.png")

But it will only work when I compile for ios like this:

const DecorationImage(image: AssetImage("assets/images/myimage.png")

Luckily adding "assets/" as a prefix works now in all cases.

Solution 25:^[25]

I had the same issue I corrected it, you just need to put the two(uses-material-design: true and assets) in the same column and click in the upgrade dependencies but before restart android studio.

screenshot

Solution 26:^[26]

Make sure the file names do not contain special characters such as ñ for example

Solution 27:^[27]

Dec 25th, 2019 :

Whoever facing issue regarding Image not showing in Flutter , let me give you simple checkpoints :

Image.asset('assets/images/photo1.png'); -- here make sure dont use / (forward slash ) before assets.
YAML file always be clear dont use space , instead use TAB.
YAML file add entries for assets. as mentioned in above comment.

First point is very important

Solution 28:^[28]

This issue still existed in my case even after, flutter clean (deletes build folder) and proper indentations in yaml file

It got fixed by itself, as it could be an issue related to Android Studio.

Fix 1) Restart the emulator in Cold Boot mode, In Android Studio, after clicking List Virtual Devices button, click Drop down arrow (last icon next to edit icon) => Choose Cold Boot Now option. If issue still exist, follow as below

Fix 2) After changing the emulator virtual device as a workaround,

For Example : From Nexus 6 to Pixel emulator

--happy coding!

Solution 29:^[29]

After declaring correctly in pubspec.yaml, consider giving full path of the image ex.

'assets/images/about_us.png'

instead of just images/..

worked for me after wasting 2 hours on such a trivial error.

Solution 30:^[30]

I was also facing the same issue . The issue on my side was that the image name was having the space in between its name so I updated the image name with the new name that does not have any space.

Image name creating the error was comboclr emtpy no circle.png

I updated this name to comboclr_emtpy_no_circle.png

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
Solution 2	yathavan
Solution 3
Solution 4	Deepak Jha
Solution 5	Alexandre Jean
Solution 6
Solution 7	Mahinthan177
Solution 8	Umer Waqas CEO Fluttydev
Solution 9	Arinzehills
Solution 10
Solution 11	Dharman
Solution 12	KenChoi
Solution 13	Amit Kumar
Solution 14
Solution 15	Good man
Solution 16	YMG
Solution 17	Ankur Lahiry
Solution 18	SandaliTP
Solution 19
Solution 20	Hieu Vo
Solution 21	defemz
Solution 22	Miki
Solution 23
Solution 24	Babao
Solution 25	Gerard Roche
Solution 26	Hecucent Bryant
Solution 27	Shobhakar Tiwari
Solution 28
Solution 29	Soropromo
Solution 30	Rakesh Verma

'FlutterError: Unable to load asset

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I had to uninstall the app and then run everything again.

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