Fatal error: Class 'Artisaninweb\SoapWrapper\ServiceProvider' not found

how to fix this problem in laravel 5.1. Did I forgot something in following this steps http://ift.tt/WwvM9R . Also I'm a little bit confused where to put this register class alias:

class_alias('Artisaninweb\SoapWrapper\Facades\SoapWrapper', 'SoapWrapper');

Thanks! :)

via Chebli Mohamed