Hello black_end,
First, please use english when you post to this forum, if not, you will hardly get an answer...
I think I got what you mean, and it's a simple mistake with caps : you're trying to extend the Controller CI's Core Class to create your own controller, but there's a little mistake in your extends.
PHP Code:
class Hello extends Controller
CodeIgniter classes are case sensitive so it will not work if you don't follow framework's naming conventions.
Regards,
$this.