Warning: include_once(XML/sql2xml.php): failed to open stream: No such file or directory in /var/www/html/contrib/sql2xml.php on line 2

Warning: include_once(): Failed opening 'XML/sql2xml.php' for inclusion (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/html/contrib/sql2xml.php on line 2

Fatal error: Uncaught Error: Class 'xml_sql2xml' not found in /var/www/html/contrib/sql2xml.php:4
Stack trace:
#0 {main}
  thrown in /var/www/html/contrib/sql2xml.php on line 4