There's some error on my Flutter Local Notification

I have faced this, and in my case it was an icon problem app_icon
in your initState function replace this

 var initializationSettingsAndroid = new AndroidInitializationSettings('app_icon');

with this

 var initializationSettingsAndroid = new AndroidInitializationSettings('@mipmap/ic_launcher');

Hope this helps you.

this one works for me you can give a chance

  @override  initState() {    super.initState();to the Android head project    var initializationSettingsAndroid =    AndroidInitializationSettings('app_icon');    var initializationSettingsIOS = IOSInitializationSettings(        onDidReceiveLocalNotification: onDidReceiveLocalNotification);    var initializationSettings = InitializationSettings(        initializationSettingsAndroid, initializationSettingsIOS);    flutterLocalNotificationsPlugin.initialize(initializationSettings,        onSelectNotification: onSelectNotification);  }  Future<void> _showNotification() async {    var androidPlatformChannelSpecifics = AndroidNotificationDetails(        'your channel id', 'your channel name', 'your channel description',        importance: Importance.Max, priority: Priority.High, ticker: 'ticker');    var iOSPlatformChannelSpecifics = IOSNotificationDetails();    var platformChannelSpecifics = NotificationDetails(        androidPlatformChannelSpecifics, iOSPlatformChannelSpecifics);    await flutterLocalNotificationsPlugin.show(        0, 'plain title', 'plain body', platformChannelSpecifics,        payload: 'item x');  } Future<void> onSelectNotification(String payload) async {    if (payload != null) {      debugPrint('notification payload: ' + payload);    }}

There is problem in your plugin initialization. I see in your code, you created the instance flutterLocalNotificationsPlugin but used FlutterLocalNotificationsPlugin().initialize() instead. And then you tried to show notification with the created instance which has not been initialized.

I got this error for the same reason - my FlutterLocalNotificationsPlugin was not initialized properly. To check if it is, I tried the below code:

void main() {  runApp(MyApp());  initializeNotification(); //Its Important to place this line after runApp() otherwise FlutterLocalNotificationsPlugin will not be initialize and you will get the error as mentioned in the question.}void initializeNotification() async {  try {    flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();    var initializationSettingsAndroid = AndroidInitializationSettings('app_icon');    var initializationSettingsIOS = IOSInitializationSettings();    var initializationSettings = InitializationSettings(initializationSettingsAndroid, initializationSettingsIOS);    await flutterLocalNotificationsPlugin.initialize(initializationSettings, onSelectNotification: didSelectNotification);  } catch(e) {   print(e.toString());  }}

If it catch any exception, your flutterLocalNotificationsPlugin has not been initialized, and you will get an error.

Also try to wrap initialization code in separate async-await function.