The alert The message “The value of the field ‘_images’ isn’t used” suggests that you have a private variable in your Dart code called _images, which is declared but never used. This can occur when you define a variable that you later decide you don’t need for temporary storing or for use in future development.

To resolve this warning, you have a couple of options:

• Use the Variable: Make sure you are utilising the variable _images in your code where it is required if it is meant to be used in your application (e.g., to hold a list of images). This may be putting it in a calculation, sending it to a widget, or showing it in your user interface.
• Eliminate the Variable: You can safely remove the _images variable from your code if it is no longer required. This will remove the warning and tidy up your codebase. Make sure the variable isn’t utilised anywhere in your codebase before removing it.

The following is an illustration of how the _images variable could be utilised if it were designed to store a list of picture paths:

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

class _MyWidgetState extends State<MyWidget> {
  List<String> _images = ['image1.png', 'image2.png'];

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: _images.length,
      itemBuilder: (context, index) {
        return Image.asset(_images[index]);
      },
    );
  }
}

In this example, _images is used to display a list of images in a ListView. If you had a similar use case but had mistakenly removed the usage, you would add it back in as shown above.

If the variable is not needed, simply remove its declaration:

class _MyWidgetState extends State<MyWidget> {
  // Removed _images variable as it's not used
}