Symfony 2奏鸣曲管理包的显示动作不工作

我按照Symfony 2 jobeet教程将Sonata Admin Bundle集成到我的Symfony 2.6应用程序中。一切都很好，除了Show动作。我有一个完整的"Job"我有一个src/Ibw/JobeetBundle/Admin/JobAdmin.php它有一个函数configurShowField(ShowMapper $showMapper)如下

<?php
namespace Ibw'JobeetBundle'Admin;
use Sonata'AdminBundle'Admin'Admin;
use Sonata'AdminBundle'Datagrid'ListMapper;
use Sonata'AdminBundle'Datagrid'DatagridMapper;
use Sonata'AdminBundle'Validator'ErrorElement;
use Sonata'AdminBundle'Form'FormMapper;
use Sonata'AdminBundle'Show'ShowMapper;
use Ibw'JobeetBundle'Entity'Job;
class JobAdmin extends Admin
{
    // ....
    protected function configureShowField(ShowMapper $showMapper)
    {
        $showMapper
            ->add('category')
            ->add('type')
            ->add('company')
            ->add('webPath', 'string', array('template' => 'IbwJobeetBundle:JobAdmin:list_image.html.twig'))
            ->add('url')
            ->add('position')
            ->add('location')
            ->add('description')
            ->add('how_to_apply')
            ->add('is_public')
            ->add('is_activated')
            ->add('token')
            ->add('email')
            ->add('expires_at')
        ;
    }
    // ....
}

当我点击Show按钮并转到视图页面(admin/ibw/jobeet/job/xxx/Show)时，它没有显示任何字段。原模板处理为/vendor/sonata-project/admin-bundle/Resources/views/CRUD/base_show.html.twig:

{% extends base_template %}
{% block actions %}
    <li>{% include 'SonataAdminBundle:Button:edit_button.html.twig' %}</li>
    <li>{% include 'SonataAdminBundle:Button:history_button.html.twig' %}</li>
    <li>{% include 'SonataAdminBundle:Button:list_button.html.twig' %}</li>
    <li>{% include 'SonataAdminBundle:Button:create_button.html.twig' %}</li>
{% endblock %}
{% block tab_menu %}{{ knp_menu_render(admin.sidemenu(action), {'currentClass' : 'active', 'template': admin_pool.getTemplate('tab_menu_template')}, 'twig') }}{% endblock %}
{% block show %}
    <div class="sonata-ba-view">
        ***
        {{ sonata_block_render_event('sonata.admin.show.top', { 'admin': admin, 'object': object }) }}
        {% for name, view_group in admin.showgroups %}
            <table class="table table-bordered">
                {% if name %}
                    <thead>
                        {% block show_title %}
                            <tr class="sonata-ba-view-title">
                                <th colspan="2">
                                    {{ admin.trans(name) }}
                                </th>
                            </tr>
                        {% endblock %}
                    </thead>
                {% endif %}
                <tbody>
                    {% for field_name in view_group.fields %}
                        {% block show_field %}
                            <tr class="sonata-ba-view-container">
                                {% if elements[field_name] is defined %}
                                    {{ elements[field_name]|render_view_element(object) }}
                                {% endif %}
                            </tr>
                        {% endblock %}
                    {% endfor %}
                </tbody>
            </table>
        {% endfor %}
        {{ sonata_block_render_event('sonata.admin.show.bottom', { 'admin': admin, 'object': object }) }}
    </div>
{% endblock %}

除了我打印的三个星号外，没有显示<div class="sonata-ba-view"></div>的内部内容。我是否遗漏了任何配置?