Warning: require(mainfile.php): failed to open stream: No such file or directory in /home/r41368prep/public_html/sitemap2.php on line 2

Fatal error: require(): Failed opening required 'mainfile.php' (include_path='.:/opt/alt/php54/usr/share/pear:/opt/alt/php54/usr/share/php') in /home/r41368prep/public_html/sitemap2.php on line 2