Warning: require_once(header.php): failed to open stream: No such file or directory in /opt/lampp/htdocs/srgdb/srgdb.php on line 10

Fatal error: require_once(): Failed opening required 'header.php' (include_path='.:/opt/lampp/lib/php') in /opt/lampp/htdocs/srgdb/srgdb.php on line 10