Based on the error message, it seems that there is a NullPointerException occurring in your HomeWidgetBackgroundService class in the onCreate method on line 55. The error is related to a null object reference of FlutterCallbackInformation.callbackLibraryPath.
One possible reason for this error is that the Flutter engine is not initialized properly in the background service. The Flutter engine needs to be initialized before any Flutter code can be executed, so you may want to check if the initialization process is complete and if the engine is properly set up.
Another possible reason for this error is that there may be a problem with your callback setup. Check if the callback information is being properly set up and if all the necessary parameters are being passed correctly.
Additionally, you can try to update your Flutter SDK and/or dependencies to the latest versions, as this can sometimes fix issues related to the Flutter engine.
You may also want to try enabling verbose logging in your app to get more detailed error messages, which can help you pinpoint the exact cause of the issue.
If none of the above solutions work, you may want to try reaching out to the package author or posting your question on relevant forums or community groups to get more help from other developers.