세션쪽 공부를 해볼려고 하던 중

autoload[libraries']=array('session') 하여

불러오니 에러를 내뿜는데 어느곳이 에러인지모르겠습니다;

A PHP Error was encountered

Severity: Warning

Message: mkdir(): Invalid path

Filename: drivers/Session_files_driver.php

Line Number: 117

Backtrace:

File: C:\web\Apache24\htdocs\application\controllers\topic.phpLine: 5Function: __construct

File: C:\web\Apache24\htdocs\index.phpLine: 315Function: require_once

Warning: Uncaught Exception: Session: Configured save path '' is not a directory, doesn't exist or cannot be created. in C:\web\Apache24\htdocs\system\libraries\Session\drivers\Session_files_driver.php:119 Stack trace: #0 [internal function]: CI_Session_files_driver->open('', 'ci_session') #1 C:\web\Apache24\htdocs\system\libraries\Session\Session.php(140): session_start() #2 C:\web\Apache24\htdocs\system\core\Loader.php(1292): CI_Session->__construct() #3 C:\web\Apache24\htdocs\system\core\Loader.php(1185): CI_Loader->_ci_init_library('Session', 'CI_', NULL, 'session') #4 C:\web\Apache24\htdocs\system\core\Loader.php(1048): CI_Loader->_ci_load_stock_library('Session', 'Session/', NULL, NULL) #5 C:\web\Apache24\htdocs\system\core\Loader.php(1093): CI_Loader->_ci_load_library('Session', NULL, NULL) #6 C:\web\Apache24\htdocs\system\core\Loader.php(218): CI_Loader->_ci_load_library('Session', NULL, NULL) #7 C:\web\Apache24\htdocs\system\core\Loader.php(202): CI_Loader->library('session', NULL) #8 C:\web\Apache24\htdocs\s in C:\web\Apache24\htdocs\system\libraries\Session\drivers\Session_files_driver.php on line 119Fatal error: session_start(): Failed to initialize storage module: user (path: ) in C:\web\Apache24\htdocs\system\libraries\Session\Session.php on line 140

이런 엄청난 양의 에러는 내뿜는데;; 어느곳에서 설정을 잘못한것일까요?