BIG BUG

[badshamasala]

Warning: In index.html:37: Local variable for "serviceWorkerVersion" is deprecated. Use "{{flutter_service_worker_version}}" template token instead. See
https://docs.flutter.dev/platform-integration/web/initialization for more details. Warning: In index.html:46: "FlutterLoader.loadEntrypoint" is deprecated. Use "FlutterLoader.load" instead. See https://docs.flutter.dev/platform-integration/web/initialization for more details. ../../AppData/Local/Pub/Cache/hosted/pub.dev/get-4.6.5/lib/get_navigation/src/extension_navigation.dart:222:62: Error: The getter 'backgroundColor' isn't
defined for the class 'ThemeData'.

• 'ThemeData' is from 'package:flutter/src/material/theme_data.dart' ('../../Downloads/flutter_windows_3.3.2-stable/flutter/packages/flutter/lib/src/material/theme_data.dart'). Try correcting the name to the name of an existing getter, or defining a getter or field named 'backgroundColor'. TextStyle(color: confirmTextColor ?? theme.backgroundColor), ^^^^^^^^^^^^^^^ Waiting for connection from debug service on Chrome... 27.0s Failed to compile application.

[ZhuJHua]

For the first two hints, it seems like just a warning, and may related to the version of flutter. You can try running flutter clean and than build again. For error, you should update getx into newest version.