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When I am running any command that uses dart the response is always as follows;

building flutter tool... 
Running  Pub upgrade... 
The current Dart SDK version is 2.10.0-0.0.dev.flutter-9dca49e71e.

Because flutter_tools depends on collection >=1.15.0-nnbd <1.15.0-nullsafety.2 which requires SDK version >=2.9.0-18.0 <=2.9.10, version solving failed.

I am not able to switch the version nor the channel as those commands run through the same response. I tried to uninstall flutter and dart, but I have only gotten back to the same issues.

Any help?

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  • 2
    Please share your pubspec.yaml. Commented Jul 24, 2020 at 17:24
  • Hi also going encountering this problem. Commented Aug 10, 2020 at 7:40

2 Answers 2

Reset to default
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Navigate to where to your flutter install directory e.g. C:\Tools\Flutter and do a git pull.

After that you should be able to run any command, such as flutter --help and the Dart SDK will be on the correct version.

This can be verified by running flutter upgrade

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I just needed to update my Path ENV Variable

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2 Comments

can you be specific? what exactly did you change to get this fixed?
Interested in too. Have same problem

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