'Error: The class 'NavigatorObserver' can't be used as a mixin because it isn't a mixin class nor a mixin.'

Question

I downloaded my code from FlutterFlow and I'm trying to run it. But it gives me this error

Error: The class 'NavigatorObserver' can't be used as a mixin because it isn't a mixin class nor a mixin.

Here is a version of the code from FlutterFlow

class GoRouter extends ChangeNotifier with NavigatorObserver {
...
}

Any help is appreciated thanks

What is a NavigatorObserver class, Please add a code snippet of it. If you recently updated to latest Flutter and Dart, then there is a breaking change. If you want to use a class as mixin then add mixin to the class `mixin class NavigatorObserver{}` https://dart.dev/resources/dart-3-migration#mixin — Mohan Sai Manthri, Jun 01 '23 at 01:59

score 0 · Answer 1 · edited Jun 09 '23 at 15:50

0

Try replacing the extends with implements:

class GoRouter implements ChangeNotifier with NavigatorObserver {
  ...
}

edited Jun 09 '23 at 15:50

Tyler2P

answered Jun 09 '23 at 01:31

I tried this and it didn't work. But the fix I discovered is that I went to router.dart I think then I added a "mixin" keyword in the NavigorObserver class and it worked. – rtp_46 Jun 10 '23 at 12:50
oh okay. Great! – SEYRAM EMMANUEL AGBANYO Jun 15 '23 at 10:30

1 Answers1