$autoload[libraries] problem

[eluser]Unknown[/eluser]
Hi, I'm new to CodeIgniter. Just doing a few tutorials and I've been hitting some issues.

I've got 2.0.3 installed and tried to autoload the database.

$autoload['libraries'] = array('database');

It gives me an error.

Unable to locate the specified class: Exceptions.php

Not sure why this is happening.... Help would be appreciated.