Could not navigate to initial route.

[h-assefi]

This is the error message I get

Could not navigate to initial route.
The requested route name was: "/flushbarRoute"
There was no corresponding route in the app, and therefore the initial route specified will be ignored and "/" will be used instead.

And, this is how I used Flushbar

Flushbar(
          title:  "ERROR",
          message:  "ErrorMessage",
          duration: const  Duration(seconds: 3),
          backgroundColor: Styles.getColorError(),
        ).show(NavigationService.navigatorKey.currentContext!);

NavigationService.navigatorKey.currentContext is a global context key.