Warning: include(gen_sitemap_db.php): failed to open stream: No such file or directory in /var/www/html/sitemap_html.php on line 3

Warning: include(): Failed opening 'gen_sitemap_db.php' for inclusion (include_path='.:/usr/local/lib/php') in /var/www/html/sitemap_html.php on line 3

Fatal error: Class 'Db' not found in /var/www/html/sitemap_html.php on line 4