HMVC Library Loading

[eluser]dag[/eluser]
Hi all,

i have a problem loading a module library from within a non-module controller.
my application looks like this

-core
-controllers
home.php

-misc
-modules
-customers
-controllers
-libraries
Customers_lib.php (contains a class Customers_lib )

when i try to load the customers library from within the home controller

Code:

$this->load->library('customers/customers_lib);

i recieve the following error

"Unable to load the requested class: customers_lib"

anyone any hints?

thank in advance

dag