FlutterError Unable to load asset

Question

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 yaml file  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               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 lt ByteData gt  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     ----------------------------------------------------------------------------------------------------

User · Answer

I put my images in a subdirectory of the assets folder. Whenever I add new images, I restart the application and it works fine.

 assets:
    - assets/sub_folder/

I do this so that I don't have to list each asset name.

User · Answer

Please provide the exact image name including the extension  as specified in the images folder  A mismatch can trigger this exception

User · Answer

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

User · Answer

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

User · Answer

I ran into this issue and very nearly gave up on Flutter until I stumbled upon the cause   In my case what I was doing was along the following lines  static Future lt String gt  resourceText String resName  async    try       ZLibCodec zlc   new ZLibCodec gzip false raw true level 9     var data  await rootBundle load  assets path to  resName      String result   new    String fromCharCodes zlc decode puzzleData buffer asUint8List        return puzzle     catch e       debugPrint  Resource Error  resName  e      return             static Future lt String gt  fallBackText String textName  async    if  testCondtion  return  Some Required Text    else return resourceText  default         where Some Required Text was a text string sent back if the testCondition was being met   Failing that I was trying to pick up default text from the app resources and send that back instead   My mistake was in the line return resourceText  default      After changing it to read return await resourceText  default   things worked just as expected   This issue arises from the fact that rootBundle load operates asynchronously   In order to return its results correctly we need to await their availability which I had failed to do   It strikes me as slightly surprising that neither the Flutter VSCode plugin nor the Flutter build process flag up this as an error   While there may well be other reasons why rootBundle load fails this answer will  hopefully  help others who are running into mysterious asset load failures in Flutter

User · Answer

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

User · Answer

I haved a similar problem  I fixed here   uses-material-design  true  assets     - assets images    After  do    Flutter Clean

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

While I was loading a new image in my asset folder  I just encountered the problem every time  I run flutter clean  amp  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

User · Answer

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

User · Answer

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

User · Answer

Flutter uses the pubspec yaml file  located at the root of your project  to identify assets required by an app  Here is an example  flutter    assets      - assets my icon png     - assets background png  To include all assets under a directory  specify the directory name with the   character at the end  flutter    assets      - directory      - directory subdirectory   For more info  see https   flutter dev docs development ui assets-and-images

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

Don t struggle to add the path to each image asset  instead just specify the path to your images directory  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   new Image asset  images pizza1 png  width 300 height 100

User · Answer

Well in case you have changed everything in the indentation part as told and checked for the typo errors but still get an error then you should do this simple which worked for me and it seems this is overlooked by almost everyone even if you have correct spacing after the assets  you still might be doinbg this one thing wrong keep the indentation in this order flutter   lt 2 spaces gt assets   lt no space gt - assets images image png thus it should look like this flutter    assets    - assets images image png

User · Answer

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

User · Answer

I have the same issue  I ve just run    flutter clean   then everything is OK   More about this error

User · Answer

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

User · Answer

inside pubspec yaml  DON T USE TAB   flutter   lt space gt  lt space gt assets   lt space gt  lt space gt  lt space gt  lt space gt assets   example  flutter    assets      assets

User · Answer

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

User · Answer

In my case a restart didn t help  I had to uninstall the app and then run everything again  It did worked

User · Answer

I had the same error when trying to add an image to a module inside a larger project turns out the Image asset widget takes a packages parameter that you can specify  after specifying it worked just fine

User · Answer

My issue was nested folders  I had my image in assets images logo xyz png and thought that - assets images  would catch all subfolders  You have to explicitly add each nested subfolder Solution  - assets images logo  etc

[flutter] FlutterError: Unable to load asset

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