Warning: require_once(header.php): failed to open stream: No such file or directory in /var/www/html/alumni/news_summer_internship.php on line 2

Fatal error: require_once(): Failed opening required 'header.php' (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/html/alumni/news_summer_internship.php on line 2