laravel service provider unresolvable dependency

I wanna use the youtube wrapper service provider from alaouy and I'm getting the following error.

Unresolvable dependency resolving [Parameter #0 [ $key ]] in class Alaouy\Youtube\Youtube

This is my code inside the controller:

use Alaouy\Youtube\Youtube;

class UrlController extends Controller
{
    public function search(Request $request, Youtube $yt)
    {
        $yt->parseVIdFromURL($request->input('url'));
    }

    ....

via Chebli Mohamed