Version solving failed

Question

Suddenly in project I got an error 'import js.dart' or smth like that. I found a command tip 'flutter channel beta' so I changed, upgraded, and after that nothing works.

When I run any command in flutter I get error:

Building flutter tool...
The current Dart SDK version is 2.10.0-0.0.dev.flutter-a3815b6590.

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.
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds...

Thank you in advance

Does this answer your question? [Flutter After Upgrade can't run application version solving failed](https://stackoverflow.com/questions/51886318/flutter-after-upgrade-cant-run-application-version-solving-failed) — Mobina, Aug 01 '20 at 11:27
Hello, it doesn't because I don't use this plugin and not only none of app can run, I can't even use any command — nzxcvbnm, Aug 01 '20 at 11:36
Yes, but now this and every other command gives me error from quest — nzxcvbnm, Aug 01 '20 at 11:51
So maybe try downgrading it then. See this github issue: https://github.com/flutter/flutter/issues/62146 — Mobina, Aug 01 '20 at 11:53

score 3 · Answer 1 · edited Aug 17 '20 at 15:40

3

I just cd to flutter root folder then "git pull origin --ff-only", finally type "flutter upgrade".

edited Aug 17 '20 at 15:40

Dharman

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answered Aug 17 '20 at 15:35

hoangphucptit

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Version solving failed

1 Answers1