Fatal error: Uncaught Error: Call to undefined method Mongo_db::delete_all() in /var/www/html/application/libraries/MY_Session.php:610 Stack trace: #0 /var/www/html/application/libraries/MY_Session.php(173): MY_Session->_sess_gc() #1 /var/www/html/system/core/Loader.php(1099): MY_Session->__construct() #2 /var/www/html/system/core/Loader.php(938): CI_Loader->_ci_init_class('session', 'MY_', NULL, NULL) #3 /var/www/html/system/core/Loader.php(216): CI_Loader->_ci_load_class('Session', NULL, NULL) #4 /var/www/html/system/core/Loader.php(1178): CI_Loader->library('session') #5 /var/www/html/system/core/Loader.php(152): CI_Loader->_ci_autoloader() #6 /var/www/html/system/core/Controller.php(51): CI_Loader->initialize() #7 /var/www/html/application/controllers/main.php(6): CI_Controller->__construct() #8 /var/www/html/system/core/CodeIgniter.php(308): Main->__construct() #9 /var/www/html/index.php(202): require_once('/var/www/html/s...') #10 {main} thrown in /var/www/html/application/libraries/MY_Session.php on line 610