Incorrect use of parent data widget. expanded widgets must be placed inside flex widgets

I am getting the following error:

i.e.., Another exception was thrown: Incorrect use of ParentDataWidget. showing error on the mobile screen.

 @override
  Widget build(BuildContext context) {

    return MaterialApp(
      title: widget.title,
      theme: ThemeData.light().copyWith(
        platform: _platform ?? Theme.of(context).platform,
      ),
      home: DefaultTabController(
        length: categoryNames.length,
        child: Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
                 ),
        body: SafeArea(
            child: Column(
              children: <Widget>[
                Chewie(
                  controller: _chewieController,
                ),
                TabBar(
                  labelColor:Colors.black,
                  tabs: categoryNames,
                ),
                Expanded(
                  child: TabBarView(
                    children: [
                      ImageList()
                    ],
                  ),
                )
                /*TabBarView(
                  children: [
                    Icon(Icons.directions_car),
                    Icon(Icons.directions_transit),
                    Icon(Icons.directions_bike),
                  ],
                )*/
              ],
            )
        ),
      ),
      ),
    );
  }

It's my code, please check and let me know the issue.

Expanded cannot be used inside a Stack.

You should use Expanded only within a Column, Row or Flex

First Rule: use Expanded only within a column, row or flex.

Second Rule: Parent column that have expanded child column must be wrapped with expanded as well

there are may things to get this problem

1. Under ListView don't use Spacer Widget
2. don't use Positioned under Row or Column
3. Expanded can only use it must be a descendant of Column Row Flex

there's no expanded in my code so i found that using Spacer() too can cause this error if it's inside a listview

In my case, I was using Positioned inside a column. Removing it solved the problem!

I removed a Positioned widget that was inside a Container inside a Stack and the problem "Incorrect use of ParentDataWidget" went away.

when I skip the video, the chewie controller shows these errors when I fix in chewie package error gone.

please fix in material_controls.dart here

[remove expanded widget in Stack widget]

return MouseRegion(
  onHover: (_) {
    _cancelAndRestartTimer();
  },
  child: GestureDetector(
    onTap: () => _cancelAndRestartTimer(),
    child: AbsorbPointer(
      absorbing: notifier.hideStuff,
      child: Stack(
        children: [
          if (_latestValue.isBuffering)
            const Expanded(
              child: Center(
                child: CircularProgressIndicator(),
              )
            )
          else
            _buildHitArea(),
          _buildActionBar(),
          Column(
            mainAxisAlignment: MainAxisAlignment.end,
            children: <Widget>[
              if (_subtitleOn)
                Transform.translate(
                  offset: Offset(
                      0.0, notifier.hideStuff ? barHeight * 0.8 : 0.0),
                  child:
                      _buildSubtitles(context, chewieController.subtitle!),
                ),
              _buildBottomBar(context),
            ],
          ),
        ],
      ),
    ),
  ),
);

}

This Solution works only if you are using Position as a parent of row or column

In my case, I was using Positioned inside a column. Removing it solved the problem!

Else

Always remember to use Expanded in Row, Column or Flex

In my case, I was using Expanded inside a Padding widget. Padding was inside a column but since Expanded was wrapped by a Padding it gave me the error. Simply removing Expanded solved my issue.

In my case it was because I was enclosing an Expanded inside a SizedBox, I just enclosed the Expanded inside a Row and that's it.