[eluser]garrettheel[/eluser]
Scratch that, didn't have hooks turned on in the config (oops).
Now I have a new error, it's to do with the the $CI global you used.
Fatal error: Call to a member function helper() on a non-object in /ci/system/application/hooks/access.php on line 8
Line 8 is $CI->load->helper('url');
So I think there's a problem getting the CI object?