Flutter popUntil throws Bad state: Future already completed [duplicate] - dart

Question

This question already has answers here:
Using Navigator.popUntil and route without fixed name
(2 answers)
Closed 3 years ago.
I have screens A->B->C->D
In B, C, D screens there is a button that should take you to screen A keeping it's state (thus pushNamedAndRemoveUntil isn't appropriate here).
I want to use popUntil, that's how I do it, based on docs:
Navigator.popUntil(context, ModalRoute.withName(ScreenName.mainScreen));
I get an error:
Bad state: Future already completed
Here is my main:
void main() {
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown,
]);
final pages = {
ScreenName.mainScreen: (settings) => MaterialPageRoute(
builder: (context) => MainScreen(), settings: settings),
};
var configureApp = AppConfig(
appName: 'TaskerMate',
flavorName: FLAVOR_NAME.PROD,
child: AppModelProvider(
model: AppModel(),
child: MaterialApp(
theme: TMTheme().get(),
home: SplashScreen(),
onGenerateRoute: (settings) {
pages[settings.name](settings);
},
routes: {ScreenName.mainScreen: (context) => MainScreen()},
),
),
);
Logger.root.level = Level.ALL;
Logger.root.onRecord.listen((LogRecord rec) {
print('${rec.level.name}: ${rec.time}: ${rec.message}');
});
runApp(configureApp);
}
ScreenName.mainScreen -> static final String mainScreen = '/main';

Answer 1

Took me ages to find the answer, but if anyone finds themselves stuck with this problem, Rémi Rousselet's answer to another question is what solved it for me:
Navigator.pushReplacement(
context,
MaterialPageRoute(settings: RouteSettings(name: "Foo")),
);
Add settings to MaterialPageRoute with name, then call popUntil like so:
Navigator.popUntil(context, ModalRoute.withName("Foo"))