Unhandled Exception: NoSuchMethodError: The method 'showNotificationDaily' was called on null in flutter

Question

I'm trying to implement local notifications but I'm facing the NoSuchMethodError, I have debugged the code and find the issue but didn't find the correct solution for it. I have created the notification manager class I'm calling it like this in AddNotification.dart Stateful class

 final NotificationManager manager;
  const AddNotification(this.manager);

then call it like this in its State class:

widget.manager.showNotificationDaily(1, "Asar", "isNotification", hour, minute);

and in the previous class from where AddNotification is called is I have sent a Notification manager object like this.

class AllSurah extends StatefulWidget {
  NotificationManager manager;
  @override
  _AllSurahState createState() => _AllSurahState();
}
    Navigator.push(
                    context,
                    MaterialPageRoute(builder: (context) => AddNotification(widget.manager)),
                  );

I have debugged the code and find that the manager is passing null from the previous class from where the NotificationManger object is passed. How can I solve this issue?

Answer 1

Just try the below code:

 NotificationManager manager = new NotificationManager();