Fatal error: session_start(): Failed to initialize storage module: user (path: )
解決方法1：
開啟CodeIgniter設定檔，預設再 application/config/config.php
把：
$config['sess_save_path'] = NULL;改成：
$config['sess_save_path'] = BASEPATH . 'yourfoldername/cache/';解決方法2：
改用 DB session ，必須先連接資料庫，起設定好資料庫連線資訊
開啟CodeIgniter設定檔，預設再 application/config/config.php
把
$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';改成
$config['sess_driver'] = 'database';
$config['sess_save_path'] = 'ci_sessions';匯入資料表
CREATE TABLE IF NOT EXISTS `ci_sessions` (
`id` varchar(128) NOT NULL,
`ip_address` varchar(45) NOT NULL,
`timestamp` int(10) unsigned DEFAULT 0 NOT NULL,
`data` blob NOT NULL,
KEY `ci_sessions_timestamp` (`timestamp`)
);