Laravel Promocodes FatalErrorException

I'm uisng laravel 5.1 Add promocodes in laravel following github ( http://ift.tt/2sA3qNN /Promocodes )in that github guid completed upto Usagegenerate generating Promotional codes using generate method. Got this error

FatalErrorException in PromocodesServiceProvider.php line 22: Class 'Trexology\Promocodes\Facades\Promocodes' not found

via Chebli Mohamed