apache, php and codeigniter error

I installed codeigniter in apache htdocs folder, i am getting the following error when i auto load session library.

Attached Files

Thumbnail(s)
   

You have to configure the session variable in config.php.
if using file make sure the folder exist and is writeable.

I suggest you have a look in the Manual

Cheers

A good decision is based on knowledge and not on numbers. - Plato