Need to rollback on modification made on animation_controller.dart

[5c0rp264]

Hello, a few days ago a commit has been made modifying the animations for avoiding null on a parameter ( see here ). This modifications lead to an error while compiling and using Flutter "The named parameter 'vsync' isn't defined. Try correcting the name to an existing named parameter's name, or defining a named parameter with the name 'vsync'.dartundefined_named_parameter"

[Quijx]

I had the same problem a few days ago, but it resolved itself after a while somehow. I think the problem was that an older Dart SDK was used. The AnimationController clearly has a named parameter vsync, but it uses the new required keyword that was introduced with the null-safety. Try run dart --version and see if your version is hight enough. Mine is 2.8.4 and it works for me. If that checks out, maybe try raising the sdk version in the pubspec.yaml.

[DJafari]

in your pubspec.yml

change this to :

environment:
  sdk: ">=2.8.0 <3.0.0"

and flutter pub get

i'm using android studio, then i invalidate cache and restart, done!

[TahaTesser]

Hi @5c0rp264
Does above solutions works for you?
Can you please provide your flutter doctor -v your flutter run --verbose and a complete reproducible minimal code sample
Thank you

[5c0rp264]

Yes perfectly !! I mark this issue as closed, thank you !!!

[vankhoa01]

I got same issue when use master channel
It was fixed after I switch to stable channel

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.