Symfony2 Doctrine, generate:entities - php

Question

I learn Symfony2 and i have a problem with database. I use this documentation: http://symfony.com/doc/2.7/book/doctrine.html
I have Product.php class, but when i try execute this command:
php app/console doctrine:generate:entities AppBundle/Entity/Product
i get error:
"Class "AppBundle\Entity\Product" is not a valid entity or mapped super class."
This is my Product.php file:
<?php
/**
* Created by PhpStorm.
* User: Marcin
* Date: 20.12.2015
* Time: 23:33
*/
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity
* #ORM\Table(name="product")
*/
class Product
{
/**
* #ORM\Column(type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #ORM\Column(type="string", length=100)
*/
protected $name;
/**
* #ORM\Column(type="decimal", scale=2)
*/
protected $price;
/**
* #ORM\Column(type="text")
*/
protected $description;
}
Other people have the same error, but they don't have "#ORM\Entity" in their code. I have, but problem still existing.
I have no idea what's going on...
Update:
This is fragment of config.yml:
doctrine:
dbal:
driver: pdo_mysql
host: localhost
port: 3306
dbname: db_name
user: db_user
password: db_password
charset: UTF8
# if using pdo_sqlite as your database driver:
# 1. add the path in parameters.yml
# e.g. database_path: "%kernel.root_dir%/data/data.db3"
# 2. Uncomment database_path in parameters.yml.dist
# 3. Uncomment next line:
# path: "%database_path%"
orm:
auto_generate_proxy_classes: "%kernel.debug%"
naming_strategy: doctrine.orm.naming_strategy.underscore
auto_mapping: true
Updated2:
I changed config.yml:
orm:
auto_generate_proxy_classes: "%kernel.debug%"
# naming_strategy: doctrine.orm.naming_strategy.underscore
# auto_mapping: true
entity_managers:
default:
mappings:
AppBundle: ~
And when i use:
php app/console doctrine:mapping:info
I get:
"You do not have any mapped Doctrine ORM entities according to the current configuration. If you have entities or mapping files you should check your mapping configuration for errors."