404.php

<?php
/**
 * Genesis Framework.
 *
 * WARNING: This file is part of the core Genesis Framework. DO NOT edit this file under any circumstances.
 * Please do all modifications in the form of a child theme.
 *
 * @package Genesis\Templates
 * @author  StudioPress
 * @license GPL-2.0+
 * @link    https://my.studiopress.com/themes/genesis/
 */

// Remove page title .
remove_action( 'genesis_loop', 'genesis_custom_page_title', 5 );
add_action( 'genesis_loop', 'genesis_404' );
/**
 * This function outputs a 404 "Not Found" error message.
 *
 * @since 1.6
 */
function genesis_404() {

	genesis_markup( array(
		'open'    => '<h1 %s>',
		'close'   => '</h1>',
		'content' => apply_filters( 'genesis_404_entry_title', __( 'Not found, error 404', 'genesis' ) ),
		'context' => 'entry-title',
	) );
}

genesis();