fix

application/config/autoload.php

@@ -79,7 +79,7 @@ $autoload['libraries'] = array('database', 'session', 'form_validation');
 |	$autoload['drivers'] = array('cache' => 'cch');
 |
 */
-$autoload['drivers'] = array('session_database');
+$autoload['drivers'] = array('session');
 
 /*
 | -------------------------------------------------------------------

application/config/config.php

@@ -377,12 +377,11 @@ $config['encryption_key'] = 'GLn08ulSFJM3dTx4Q17o7hdFjlSEeX9I';
 | except for 'cookie_prefix' and 'cookie_httponly', which are ignored here.
 |
 */
+
 $config['sess_driver'] = 'database';
-$config['sess_save_path'] = 'ci_sessions';
-/*$config['sess_driver'] = 'files';*/
 $config['sess_cookie_name'] = 'ci_session';
 $config['sess_expiration'] = 7200;
-$config['sess_save_path'] = NULL;
+$config['sess_save_path'] = 'ci_sessions';
 $config['sess_match_ip'] = FALSE;
 $config['sess_time_to_update'] = 300;
 $config['sess_regenerate_destroy'] = FALSE;