Visual Studio Code - Target of URI doesn't exist 'package:flutter/material.dart'

The issue is due to the missing packages which are being used in the project. Therefore, in order to install the same, navigate to the folder where the project is present -> cmd -> execute the following commands:

• flutter packages get

• flutter packages upgrade

• restart VScode/Android studio

source: https://flutter.dev/docs/development/packages-and-plugins/using-packages

Run these commands: -

flutter clean

flutter packages get

flutter packages upgrade //( Optional - use if you want to upgrade packages )

Then restart Android Studio or Visual Studio.

Author of the Dart Code plugin here! From the screenshot, I would say this is because your flutter project is in a sub-folder of the folder open in Code. We only scan the opened-folder to check whether it's a Flutter project - which then changes the SDK we launch and also enables the Flutter functionality (like the daemon and debugger).

You should re-open the "todo" folder directly.

If you want to have multiple projects open together, use multi-root workspaces, since Dart Code is multi-root-aware and will check each of the folders in the workspace when deciding if it needs to enable Flutter functionality.

Update

This case should be better supported in the Dart plugin now, so opening the immediate parent folder of a Flutter project should work as expected.

If you have used the flutter packages get command and the error still persists, you can simply reload VS code the Developer: Reload Window command. Simply type that in after pressing Ctrl+Shift+P (Cmd+Shift+P for Mac users). It will clear the error. It's like refreshing VS Code.

Restart the VS Code you will see magic! If that's not work then check the indent of your dependencies in the pubspec.yaml

This worked for me in Android Studio as well as VS Code. I only had to run these lines in my terminal/command prompt and problem was solved. There was no need to restart any of the IDEs again

• flutter packages get

Optionally you also run.

• flutter upgrade

Open the project after deleting .idea folder and .dart_tool

Now this happens most of the time to me, whenever I open some old project(flutter project), it is basically because of not downloading or not having the packages to refer, for the VS Code, In simple just blindly do a PUB GET or just hit CTRL/CMD + s in pubspec.yaml file, and you are good to go (sometimes it might take some time to get everything set (depends on your system specs)).

old answer starts here:

Simple thing I did after Someone said here to restart the VS Code and I did that, and now everything works fine.

For me it was because just when I was creating project I got an notification for updating my dart(or related) extension and for that I did it and boom as my project started, it just gave me around 30 errors which do scared but the simple fix was to restart the editor.

Open the command palette (ctrl+shift+p), type flutter: get packages (should autocomplete); after it resolves open the command palette again and type reload window and execute the command. This should resolve the issue as quickly as possible.

Close the VS Code and Run it again

Restart your IDE, and run these commands:

• flutter clean.
• flutter pub get.
• flutter upgrade.

if they didn't work, then check your dart SDK path.

The quickest way to get Dart-Code to reliably find your Flutter install and use it is to create a new FLUTTER_ROOT environment variable and set it to your Flutter path.

1. Check for correct indentation of your package in dependencies
2. if your editor supports, it automatically runs -> flutter pub get
3. Either way -> open terminal-> flutter pub get or flutter packages get
4. check .packages file, see if your package is present else reinstall package
5. Most important : Restart your IDE (Visual studio or Android Studio)

Start debugging your project

Most probably, your errors will be fixed by then

try to run flutter clean

then restart VS Code. This did it for me.

Also happened to me while trying to run the project inside of another directory.

Worked by using the root directory of the main project

Just add dependencies: http: ^0.12.0 in pubspec.yaml file please check http documentation

I also had this issue. I had both VS code and Android studio installed in my system.

The error was in VS code.

When i opened the same project on Android studio, the dependency was not actually added to pubsec.yaml. I added it there and ran pub.get.

When I returned to VS Code and everything was working fine.

So, Try opening it in other editor if you have, or through NotePad.

Edit:

Opening widget_test.dart and running it should also solve your issue.

If you execute From the terminal: "Run flutter packages get" and the error continues, check is all packages directories are listed at '.packages' file. - Sometime you have the packages, but it is not configured at this file.

Execute one of the following:

• flutter upgrade

• flutter pub get

• flutter packages get

Warning! This package referenced a Flutter repository via the .packages file that is no longer available. The repository from which the 'flutter' tool is currently executing will be used instead.
running Flutter tool: /opt/flutter previous reference : /Users/Shared/Library/flutter This can happen if you deleted or moved your copy of the Flutter repository, or if it was on a volume that is no longer mounted or has been mounted at a different location. Please check your system path to verify that you are running the expected version (run 'flutter --version' to see which flutter is on your path).

Checking the output of the flutter packages get reveals that the reason in my case was due to moving the flutter sdk.

Do not forget:

export PATH="$PATH:/home/[xxxxx]/flutter/bin

For me, it works:

flutter upgrade

flutter packages get

You can check with

flutter doctor

flutter --version

Go to pubsec.yaml file and add this directly after cupertino_icons:

webview_flutter:

Then press Packages get on the top right corner and it will work fine with you.

Add dependencies. for example:- import 'package:audioplayers/audio_cache.dart'; in the above package if we only use this package then it shows error but if we add dependencies in pubspec.yaml such as

dependencies:
    flutter:
      sdk: flutter
    cupertino_icons: ^0.1.2
    audioplayers: ^0.14.1

then click on packages get.

as you see this, I can also insert dependencies so if you insert dependencies along with your package then you are good to go.

I was trying use the audio players flutter package. Once I added it to pubspec.yaml and tried to import it to main.dart, I got the same error.

I tried to restart my IDE but that didn't help so i tried running flutter packages pub cache repair and it worked.

If you change the property name in pubspect.yaml all your package in lib folder turn to red with the error Target of URI doesn't exist...

I was using (goggle location picker (with much more customisation in functions and UI) ) so I copy this package(complete) and using in my app in one folder but since dart code analyser analyses one flutter project so I found that those which are referencing from inside of this package is not working then I copy only lib folder(of google location picker) in my original project folder and voila this worked for me. This solution took me a time of 3 days. I know this is not the question but it might help someone to save 3 days.

I had this problem in Android Studio with the rflutter_alert package. After inserting the dependencies, I imported the package in my project with ctrl+space key and I have added import 'package:rflutter_alert/'; the problem is that this was not correct. The correct form was package:rflutter_alert/rflutter_alert.dart right vs wrong comparison

i faced the same issue with the bloc package, after i restarted visual studio i installed the package again using flutter pub add bloc and it installed properly this time. Note that i tried installing it several times, this time it was a charm

My case was different, I pretty much tried everything suggested but with no luck :( .

In my case it didn't find several packages, for some reason it could find the folder of the packages, but not the main file of it, after not finding answer online for this, i started to look into these packages and check their dependencies and saw that I was missing one, still not sure why it found the folder but not the content of it because of a dependency, anyhow, the dependency in my case was meta, which is for annotations, many packages uses it, after adding it to all relevant module in our project, pub get... and walla no errors, phew this one was very annoying...

Don't forget to save pubspec.yaml before running "flutter pub get". Restarting Visual Studio Code is not enough. That was my solution. Sometimes when you work with intellij you forget that ...