(custom) libraries won't load

[eluser]Jaimie[/eluser]
I'm facing a problem where some custom downloaded (Twitter, Gvis) classes don't get loaded even tho they are present in the directory and loaded using:

Code:

$this->load->library('Twitter');
$this->load->library('Gvis');

if'ing it returns false, so there must be something i missed.

Same with autoloading, false.

Hope someone can help me out.

Thanks