No State found for widget

Why This Happens

In Flutter, this error usually occurs when createState() returns a State object of the wrong type or when the widget type does not match its State class. Ensure the State generic type parameter matches the widget class exactly.

The Problem

class MyWidget extends StatefulWidget {
  @override
  State<MyWidget> createState() => _OtherWidgetState();
}

class _OtherWidgetState extends State<OtherWidget> {
  @override
  Widget build(BuildContext context) => Container();
}

The Fix

class MyWidget extends StatefulWidget {
  @override
  State<MyWidget> createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  @override
  Widget build(BuildContext context) => Container();
}

Step-by-Step Fix

1. 1

   Identify the error

   Look at the error about missing State. This tells you the State class does not match the StatefulWidget.

2. 2

   Find the cause

   Check if createState() returns the correct State subclass and if the State generic type matches the widget class.

3. 3

   Apply the fix

   Ensure the State class extends State<YourWidgetClass> and createState() returns an instance of the correct State class.