Warning: include(main_lib.php): failed to open stream: No such file or directory in /var/www/app/index.php on line 14

Warning: include(): Failed opening 'main_lib.php' for inclusion (include_path='.:/usr/local/lib/php:/home/archyahoo/app:/home/archyahoo/lib:/home/archyahoo/view:/home/archyahoo/cron') in /var/www/app/index.php on line 14

Fatal error: Class 'Zend_Config_Xml' not found in /var/www/app/index.php on line 16