FLUTTER ERROR: Unhandled Exception: 'package:flutter_downloader/src/downloader.dart' - flutter

Question

I've a flutter program which downloads a file by using a URL using the flutter_downloader package.I hace a button where on click will download the file.
Below is my implementation
import 'package:flutter/material.dart';
import 'package:flutter_downloader/flutter_downloader.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await FlutterDownloader.initialize(
debug: true
);
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page',key: GlobalKey(),),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({required Key key, required this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
SizedBox(height: 60,),
FlatButton(
child: Text("Start Downloading"),
color: Colors.redAccent,
textColor: Colors.white,
onPressed: () async {
final status = await Permission.storage.request();
if (status.isGranted) {
final externalDir = await getExternalStorageDirectory();
final id = await FlutterDownloader.enqueue(
url: "https://firebasestorage.googleapis.com/v0/b/storage-3cff8.appspot.com/o/2020-05-29%2007-18-34.mp4?alt=media&token=841fffde-2b83-430c-87c3-2d2fd658fd41",
savedDir: externalDir!.path,
fileName: "download",
showNotification: true,
openFileFromNotification: true,
);
} else {
print("Permission deined");
}
},
)
],
),
),
);
}
}
The error massage I get when the button is pressed is,
E/flutter (21960): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception:
'package:flutter_downloader/src/downloader.dart': Failed assertion: line 80 pos 12:
'_initialized': FlutterDownloader.initialize() must be called first
E/flutter (21960): #0 _AssertionError._doThrowNew (dart:core-
patch/errors_patch.dart:46:39)
E/flutter (21960): #1 _AssertionError._throwNew (dart:core-
patch/errors_patch.dart:36:5)
E/flutter (21960): #2 FlutterDownloader.enqueue
(package:flutter_downloader/src/downloader.dart:80:12)
E/flutter (21960): #3 _MyHomePageState.build.<anonymous closure>
(package:care_giver_app/functions_test.dart:102:54)
E/flutter (21960): <asynchronous suspension>
E/flutter (21960):
If im not wrong,it states that I have to initialize flutter_downloader first but I've already done that in line No.06-No.09 in the implementation above.
I've provided the necessary providers in the AndroidManifest file as well
<provider
android:name="vn.hunghd.flutterdownloader.DownloadedFileProvider"
android:authorities="${applicationId}.flutter_downloader.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="#xml/provider_paths"/>
</provider>
<provider
android:name="androidx.startup.InitializationProvider"
android:authorities="${applicationId}.androidx-startup"
android:exported="false"
tools:node="merge">
<meta-data
android:name="androidx.work.WorkManagerInitializer"
android:value="androidx.startup"
tools:node="remove" />
</provider>
<!-- declare customized Initializer -->
<provider
android:name="vn.hunghd.flutterdownloader.FlutterDownloaderInitializer"
android:authorities="${applicationId}.flutter-downloader-init"
android:exported="false">
<!-- changes this number to configure the maximum number of concurrent tasks -->
<meta-data
android:name="vn.hunghd.flutterdownloader.MAX_CONCURRENT_TASKS"
android:value="5" />
</provider>