A PHP Error was encountered

Severity: Error: Class 'CI_Controller' not found in /var/app/current/system/core/CodeIgniter.php:233 Stack trace: #0 /var/app/current/system/core/Lang.php(98): get_instance() #1 /var/app/current/system/database/DB_driver.php(1165): CI_Lang->load('db_lang.php') #2 /var/app/current/system/database/DB_driver.php(124): CI_DB_driver->display_error('db_unable_to_co...') #3 /var/app/current/system/database/DB.php(148): CI_DB_driver->initialize() #4 /var/app/current/application2/config/routes.php(49): DB() #5 /var/app/current/system/core/Router.php(138): include('/var/app/curren...') #6 /var/app/current/system/core/CodeIgniter.php(173): CI_Router->_set_routing() #7 /var/app/current/index.php(333): require_once('/var/app/curren...') #8 {main}

Message:

Filename:

Line Number: