Sylius Customizing Models with error class not found in namespaces

I followed the guideline on Sylius site for customizing models: http://docs.sylius.com/en/1.0/customization/model.html

When I run:

php bin/console doctrine:schema:update --force

or php bin/console doctrine:migrations:diff

Error: The class 'AppBundle\Entity\Country' was not found in the chain configured namespaces

Files added at: \src\AppBundle\Entity\Country.php \src\AppBundle\Resources\config\doctrine\Country.orm.yml

Added:

sylius_addressing:
    resources:
        country:
            classes:
                model: AppBundle\Entity\Country

at: \app\config\config.yml

And doctrine related settings on config.yml as below:

doctrine:
    dbal:
    driver: "%database_driver%"
    host: "%database_host%"
    port: "%database_port%"
    dbname: "%database_name%"
    user: "%database_user%"
    password: "%database_password%"
    server_version: "5.5"
    charset: UTF8

doctrine_migrations:
    dir_name: "%kernel.root_dir%/migrations"
    namespace: Sylius\Migrations
    table_name: sylius_migrations
    name: Sylius Migrations

Country.php

<?php
namespace AppBundle\Entity;
use Sylius\Component\Addressing\Model\Country as BaseCountry;
class Country extends BaseCountry
{
  private $flag;

  public function getFlag(): ?bool
  {
    return $this->flag;
  }

  public function setFlag(bool $flag): void
  {
    $this->flag = $flag;
  }
}

(Sylius 1.0 installed on Windows 7) Tried clear cache and many other methods but no clues.