我怎么能解决无效的驱动程序请求Session_session_id错误？

Question

使用Community Auth Codeigniter身份验证包。

登录后，我收到以下查看错误：

  

请求的驱动程序无效：Session_session_id

我查看了文档并搜索了一个没有运气的解决方案。

配置文件：http://pastebin.com/Nn7JeUDB

Debug设置为2.输出为：

DEBUG - 2016-01-17 06:15:32 --> CI_Session routines successfully run
DEBUG - 2016-01-17 06:15:32 --> Database Driver Class Initialized
DEBUG - 2016-01-17 06:15:32 --> Session class already loaded. Second attempt ignored.
DEBUG - 2016-01-17 06:15:32 --> Encryption: Auto-configured driver 'openssl'.
DEBUG - 2016-01-17 06:15:32 --> Encryption: OpenSSL initialized with method AES-128-CBC.
DEBUG - 2016-01-17 06:15:32 --> Encryption Class Initialized
DEBUG - 2016-01-17 06:15:32 --> Model Class Initialized
DEBUG - 2016-01-17 06:15:32 --> Model Class Initialized
DEBUG - 2016-01-17 06:15:32 --> Controller Class Initialized
DEBUG - 2016-01-17 06:15:32 --> XSS Filtering completed
DEBUG - 2016-01-17 06:15:32 --> XSS Filtering completed
ERROR - 2016-01-17 06:15:32 --> Invalid driver requested: Session_session_id

Session Config.php

$config['sess_driver']          = 'cookie';
$config['sess_valid_drivers']   = array();
$config['sess_cookie_name']     = 'ci_session';
$config['sess_expiration']      = 7200;
$config['sess_expire_on_close'] = FALSE;
$config['sess_encrypt_cookie']  = FALSE;
$config['sess_use_database']    = FALSE;
$config['sess_table_name']      = 'ci_sessions';
$config['sess_match_ip']        = FALSE;
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update']  = 300;