widgets not working

Question

I pasted my siderbar widget code in widgets.php file

    function right_sidebar_widget() {
    register_sidebar( array(
        'name' => 'Right Siderbar',
        'id' => 'right-siderbar',
        'description' => 'Right Sidebar',
        'before_widget' => '',
        'after_widget' => '',
        'before_title' => '<h3 class="widget-title">',
        'after_title' => '</h3>',
    ) );
}

add_action( 'after_setup_theme', 'right_sidebar_widget' );

included widgets.php file to functions.php file using

include_once 'includes/widgets.php';

But widgets not working, I got the error

The theme you are currently using isn’t widget-aware, meaning that it has no sidebars that you are able to change. For information on making your theme widget-aware, please follow these instructions.

Note: I checked, the above code working when in the functions.php and also widgets.php included successfully

Answer 1

Change this code

add_action( 'after_setup_theme', 'right_sidebar_widget' );

with

add_action( 'widgets_init', 'right_sidebar_widget' );