Scaffold.of() called with context that does not contain a Scaffold

Why This Happens

In Flutter, Scaffold.of(context) traverses up the widget tree to find a Scaffold. If the context belongs to the widget that builds the Scaffold itself, no Scaffold ancestor exists. Use ScaffoldMessenger.of(context) for showing snackbars, or use a Builder widget to get a context below the Scaffold.

The Problem

class MyPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ElevatedButton(
        onPressed: () {
          Scaffold.of(context).showBottomSheet(...); // Wrong context
        },
        child: Text('Show'),
      ),
    );
  }
}

The Fix

class MyPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Builder(
        builder: (scaffoldContext) {
          return ElevatedButton(
            onPressed: () {
              Scaffold.of(scaffoldContext).showBottomSheet(...);
            },
            child: Text('Show'),
          );
        },
      ),
    );
  }
}

Step-by-Step Fix

1. 1

   Identify the error

   Look at the error message: Scaffold.of() called with a context that does not contain a Scaffold. The context is at or above the Scaffold.

2. 2

   Find the cause

   Check if the context passed to Scaffold.of() belongs to the widget that creates the Scaffold, rather than a child of the Scaffold.

3. 3

   Apply the fix

   Use a Builder widget to obtain a context below the Scaffold, or use ScaffoldMessenger.of(context) for snackbars.