Start Flutter Desktop In The Size Of Screen

When using Windows_Manager and UI to make the app take the entire screen, I get the following error:

Invalid constant value.

Here is the code:

import 'dart:ui' as ui;
import 'package:window_manager/window_manager.dart';


void main() async {
  WidgetsFlutterBinding.ensureInitialized();
     Size logicalScreenSize = ui.window.physicalSize;
  WindowOptions windowOptions = const WindowOptions(
    size:  logicalScreenSize,                        //Error in this instruction
    center: true,
    backgroundColor: Colors.transparent,
    skipTaskbar: false,
    titleBarStyle: TitleBarStyle.hidden,
  );
  windowManager.waitUntilReadyToShow(windowOptions, () async {
    await windowManager.show();
    await windowManager.focus();
  });
  await SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitUp,
    DeviceOrientation.portraitDown,
  ]);
  runApp(const MyApp());
}

I tried to combine most of the proposed solutions here but non of them works.

EDIT

The previous error has been resolved, but the app is still not taking the size of the screen!!