Not sure if im only the one experiencing this, but after an upgrade to 3.x we are getting this error
$autoload['drivers'] =array('session');
Session is a library, not a driver. So, it's not a bug.
This has come up on the forum, which is the proper place to get help with CodeIgniter.
Check Once on this Codeigniter(your CI root folder)\system\libraries\Session.php is exists or not, if not download a new codeigniter with the same version you are using and just copy the session.php to your running root directory.
Session is a library, not a driver. So, it's not a bug.
It works either way.
This has come up on the forum, which is the proper place to get help with CodeIgniter.
... and not only on the forums. There's 8 other issues here with titles containing the same error message, if not exactly matching this one.
Use the search bar people.
Check Once on this Codeigniter(your CI root folder)\system\libraries\Session.php is exists or not, if not download a new codeigniter with the same version you are using and just copy the session.php to your running root directory.
Not only will this not solve the problem; it will make it worse - in the 99% case, system/libraries/Session.php existing is the problem.