Class not found

[eluser]drewbee[/eluser]
You almost have it. Custom libraries are automatically extended from the core libraries.

In this case you are trying to extend the default controller, so you would need:

Code:

MY_Controller extends CI_Controller
{

}

Which, I do not think this is what you are trying to go for. It looks like you have a library you want to run:

/system/application/libraries/Auth.php

Code:

Auth extends Controller
{

}

Now, in our controller:

Code:

$this->load->library('auth');