Second Screen is blank using this package with GetX

[Deepak-Chopra]

When i use this package with Getx Routing the second not working its Black

void navigateTo() async {
displayManager.getDisplays();
displayManager.showSecondaryDisplay(
displayId: 1,
routerName: SLIDER_ROUTE,
);
Future.delayed(Duration(seconds: 2), () {
Get.offNamedUntil(DASHBOARD_ROUTE, (route) => false);
});
}

i am using this function on init when app is running when my page load this function trigger