Troubles trying to use pdfs and charger pdfs, laravel 5.0 vs moraes

My problem is when I redirect an icon to a route with the method to use in controller, but it doesnt read the variable. Look the case. I have a variable with dates called $salida Since my blade/view: "" My route: Route::resource('/pdf','pdfController'); and my controller is this: use Vsmoraes\Pdf\Pdf;

class pdfController extends Controller {

private $pdf;
/**
 * Display a listing of the resource.
 *
 * @return Response
 */
public function __construct(Pdf $pdf)
{
    $this->pdf=$pdf;
}

public function index()
{
    $html = view('mostraringresos.mostrarsalidas')->with('salidas',$salidas)->render();

    return $this->pdf
        ->load($html)
        ->show();
}

But it doesnt work. It shows to me: ErrorException in pdfController.php line 24: Undefined variable: salidas

via Chebli Mohamed