未找到Laravel 5 Class'Category'

I've installed Baum on laravel 5 and ran php artisan baum:install Category, which created Category class that look like this:

<?php
use Baum\Node;

class Category extends Node {
}

When I try to run:

$root = Category::create(['name' => 'Root category'])

I get the error:

 [Symfony\Component\Debug\Exception\FatalErrorException]
 Class 'Category' not found

I ran composer dump-autoload, but it did not help.

your declaration need to set the namespace.

<?php
namespace App; // use your app namespace
use Baum\Node;

class Category extends Node {
}

when you'll run, you can use full namespace call or with 'use' stat.

$root = App\Category::create(['name' => 'Root category']);

or

use App\Category;

$root = Category::create(...);