离子身份验证不起作用的代码点火器：无法加载请求的类：会话

So while using ionauth on CI I get the error as follows

Unable to load the requested class: Session

I've done the following things.

Copy the files from IonAuth folder to my CI project

Change the autoload.php

$autoload['libraries'] = array('database', 'session', 'ion_auth', 'uri');

In my config.php

$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = NULL;
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;

and

$config['encryption_key'] = 'uns';

But I still get the error and I really have no idea why.

I finally found the solution myself. Still with the same code above, I could get it to work.

So I check the root system/libraries and realized there's no folder Session there. Neither is there Javascript or Cache folders. I was really confused for a while then I copied the folders needed from other project I was working on and it finally worked.

So, I really have no idea how it happened, I only forked the project through git from a friend and he probably removed it somehow and was unaware of it.

Thank you for the help!