Route NotFoundHttpException with css file using Laravel

In my blade template I have {!! Html::style('css/style.css') !!} in my head.

It perfectly renders to <link media="all" type="text/css" rel="stylesheet" href="http://localhost/app/css/style.css">

However, when I try to open the link in the source of the page I get an exception:

Sorry, the page you are looking for could not be found.
NotFoundHttpException in RouteCollection.php line 161:

Any solution for this? Is it required to specify a different route?

via Chebli Mohamed