Warning: require_once(mandrill/src/Mandrill.php): failed to open stream: No such file or directory in /var/www/html/areas/classic/classic.inc.php on line 19

Fatal error: require_once(): Failed opening required 'mandrill/src/Mandrill.php' (include_path='.:/usr/share/php') in /var/www/html/areas/classic/classic.inc.php on line 19