How to publish package assets? I've found a tutorial here: <http://laravel-recipes.com/recipes/279>

But when I tried to publish assets from my workbench, I get this error:

```
[RuntimeException]         
 Unable to publish assets.  

asset:publish [--bench[="..."]] [--path[="..."]] [package]

```

My command code is:

```
php artisan asset:publish --bench=Mypackage

```

How can I get my package assets to be published.

Thank you.