为捆绑中的实体生成getter和setter

Question

我在ORM-Designer中创建了我的模型，并更改了doctrine配置文件以了解我的应用程序结构，格式如下

-app
-src
   -Acme
     - Model
        - Model_1.php
        - Model_2.php
        - ...
     - ApplicationBundle
- ...

Doctrine config：

# Doctrine Configuration
doctrine:
    dbal:
        driver:   "%database_driver%"
        host:     "%database_host%"
        port:     "%database_port%"
        dbname:   "%database_name%"
        user:     "%database_user%"
        password: "%database_password%"
        charset:  UTF8
        # if using pdo_sqlite as your database driver, add the path in parameters.yml
        # e.g. database_path: "%kernel.root_dir%/data/data.db3"
        # path:     "%database_path%"

    orm:
        auto_generate_proxy_classes: "%kernel.debug%"
        # auto_mapping: true

        mappings:
            model:
                type: yml
                dir: %kernel.root_dir%/../src/Acme/Model
                prefix: Acme\Model
                alias: Model
                is_bundle: false

Model_1.php例如：

<?php
namespace Acme\Model;
use Doctrine\ORM\Mapping AS ORM;

/** 
 * @ORM\Entity
 */
class Model_1
{
    /** 
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /** 
     * @ORM\Column(type="string", nullable=true)
     */
    private $attribute_01;

    /** 
     * @ORM\Column(type="string", nullable=true)
     */
    private $attribute_02;

    /** 
     * @ORM\Column(type="string", nullable=true)
     */
    private $attribute_03;
}

当你看到我的Model不是一个包时，当我尝试使用doctrine:generate:entities Acme命令来设置缺少getters和setters时，它会抛出以下异常：

[RuntimeExeption] Namespace "Acme" does not contain any mapped entities.

这里有什么问题？