Laravel 5 Class 'Prettus\Repository\Providers\Repository ServiceProvider' not found

I'm studing about Repository Design Pattern in Laravel and I'm using http://ift.tt/1BVSE6r to do it.

But after I copy/paste folder prettus in my project and add in my config/app.php Prettus\Repository\Providers\RepositoryServiceProvider::class to the end of the providers array I find a problem:

Class 'Prettus\Repository\Providers\Repository ServiceProvider' not found

After that, the project can't run. Please help me.

Thanks

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