flutter packages get failed depends on flutter_test any from sdk which requires SDK version <2.0.0, version solving failed

Question

I create a flutter project, and run flutter packeages get,the output as below: [second] flutter packages get Waiting for another flutter command to release the startup lock... Running "flutter packages get" in second... The current Dart SDK version is 2.0.0-dev.63.0.flutter-4c9689c1d2.

Because second depends on flutter_test any from sdk which requires SDK version <2.0.0, version solving failed.
pub get failed (1)
exit code 1

flutter doctor -v

PS D:\dartstudy\second> flutter doctor -v
[√] Flutter (Channel dev, v0.5.7, on Microsoft Windows [Version 6.1.7601], locale zh-CN)
    • Flutter version 0.5.7 at E:\flutter
    • Framework revision 66091f9696 (2 weeks ago), 2018-07-09 12:52:41 -0700
    • Engine revision 6fe748490d
    • Dart version 2.0.0-dev.63.0.flutter-4c9689c1d2

[√] Android toolchain - develop for Android devices (Android SDK 28.0.1)
    • Android SDK at f:\Android\Sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-28, build-tools 28.0.1
    • ANDROID_HOME = f:\Android\Sdk
    • Java binary at: E:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)
    • All Android licenses accepted.

[√] Android Studio (version 3.1)
    • Android Studio at E:\Program Files\Android\Android Studio
    • Flutter plugin version 26.0.1
    • Dart plugin version 173.4700
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)

[√] VS Code, 64-bit edition (version 1.25.1)
    • VS Code at C:\Program Files\Microsoft VS Code
    • Flutter extension version 2.16.0

[!] Connected devices
    ! No devices available

! Doctor found issues in 1 category.

the IDE that I use to create a project is VS code. I changed some versions of flutter sdk， the problems are the same as above，How to fix this problem?

Answer 1

Try replacing geoflutterfire: ^3.0.3 to geoflutterfire2: ^2.3.15, it worked for me

Answer 2

Inspect correctly your "pubspect.yaml" it's possible

Answer 3

I have resolved this by adding integration_test above test declaration, I saw this solution in official codelabs: https://codelabs.developers.google.com/codelabs/flutter-app-testing#2

As on pic:

I think this is a better way, than downgrading the plugin by using 'any' or changing flutter channel.

Answer 4

Just upgrade flutter to the latest version. This solved the problem for me.

flutter upgrade //for upgrading flutter enter this in CLI.

Answer 5

I solved my error by using any instead of the version codes like this

flutter_test: any

instead of

flutter_test: ^1.1.0+1

Answer 6

Maybe your Flutter SDK is not in the latest version. upgrade it by below command (and the documentation says, it is preferred to keep stable channel, upgrade to dev only if it essential)

flutter upgrade

Answer 7

So here are some options to consider in solving this issue:

If you have tried the above solutions and it didn't work, then

1. You probably have issues with your flutter SDK and need to fix that first. You have changes in your flutter SDK.

To fix this, kindly cd into your flutter directory. For instance D:\repo\flutter Find out what git changes you have in this directory using git status

Use git add * to add these changes (files) and then do git stash

To ensure that you're on the latest build from this channel, run flutter upgrade

You should be able to switch to any of your flutter channels

Stay safe. All the best

Answer 8

I have the same issue and flutter upgrade --force fixed the problem.

Note: re-run the command flutter pub get after upgrading your flutter version.

Answer 9

I know this is an outdated question but I think someone will benefit from this and also the answer is relevant not outdated.

You need to fix environment: in pubspec.yaml to allow the Dart SDK version you are using (the one from Flutter)

environment:
  sdk: ">=2.0.0-dev.68.0 <3.0.0"

The essential part is <3.0.0

Originally answered here in GitHub by someone called Günter Zöchbauer:- https://github.com/flutter/flutter/issues/21421#issuecomment-418718539

Answer 10

just update your sdk by these codes

flutter channel dev
flutter upgrade

if you live in iran you need to use proxy because google no let you to use its packages and for scoped_model you need to use below version of it in your pubspec.yaml file

dependencies:
  scoped_model: ^1.0.1

and then save the file, your IDE automatically update the package

Answer 11

Just modify the package version in pubspec.yaml to the latest version fixed my issue.

Answer 12

I was having a similar issue:

Running "flutter packages get" in austin-feeds-me-flutter...
The current Dart SDK version is 2.0.0-dev.58.0.flutter-f981f09760.

Because austin_feeds_me depends on palette_generator any which requires SDK version >=2.0.0-dev.61.0 <3.0.0, version solving failed.
pub get failed (1)
Process finished with exit code 1

I fixed it with the following commands:

flutter channel dev
flutter upgrade

Fix source: https://github.com/flutter/flutter/issues/19382

Answer 13

I found the solution of this question by myself.I add the system environment variable PUB_ALLOW_PRERELEASE_SDK=false,so Just remove this system environment variable, the question will be solved.