Can't load session library

[eluser]can35[/eluser]
Hi
I'm trying to load Session library in my site but I get the following error:

Fatal error: Call to undefined method CI_DB_mysql_driver::where() in /MY_PATH/system/libraries/Session.php on line 201

If I use: $this->load->library('session');
or try with the autoload feature, I get the same message.

What can I do?

Thanks in advance

[eluser]InsiteFX[/eluser]
Did you load the database?

[eluser]can35[/eluser]
[quote author="InsiteFX" date="1332901788"]Did you load the database?
[/quote]

Yes, I did

[eluser]can35[/eluser]
I fixed it, just needed to change active record to true in the database config file.

Code:

$active_record = TRUE;