我试图在Silex应用程序中使用树枝渲染Symfony表单。我使用Symfony 2窗体库，Symfony Bridge Twig窗体扩展和Twig。

这是我的bootsrap文件：

require_once __DIR__ . '/../app/silex.phar';
$app = new Silex\Application();

$app['debug'] = true;

// Set up the autoloader
require_once __DIR__ . '/../app/vendor/.composer/autoload.php';

// Load Configuration into container
$parser = new Symfony\Component\Yaml\Parser();
$config = $parser->parse(file_get_contents(__DIR__ . '/../app/config/config.yml'));
$app['config'] = $config;

// Set up Symfony bridge (nice twig functions)
$app->register(new Silex\Provider\SymfonyBridgesServiceProvider(), array(
'symfony_bridges.class_path' => __DIR__ . '/vendor/symfony/twig-bridge',
));

// Set Up Templating
$app->register(new Silex\Provider\TwigServiceProvider(), array(
'twig.path' => __DIR__ . '/../app/views',
'twig.class_path' => __DIR__ . '/../app/vendor/twig/twig/lib',
));

 // Set Up Database
 $app->register(new Silex\Provider\DoctrineServiceProvider(), array(
'db.options' => array(
    'driver' => $app['config']['db']['driver'],
    'host' => $app['config']['db']['host'],
    'user' => $app['config']['db']['user'],
    'password' => $app['config']['db']['password'],
    'dbname' => $app['config']['db']['dbname']
),
'db.dbal.class_path' => __DIR__ . '/vendor/doctrine/doctrine-dbal/lib',
'db.common.class_path' => __DIR__ . '/vendor/doctrine/doctrine-common/lib',
));

 // Set up the Symfony forms component
$app->register(new Silex\Provider\FormServiceProvider());

// Routes
$app->get('/', function() use($app)
{
    return $app['twig']->render('index.twig', array());
});

$app->get('/info', function() use($app)
{
    return $app['twig']->render('info.twig', array());
});

$app->get('/register', function() use($app)
{

    $builder = $app['form.factory']->createBuilder(new MppInt\Form\Type\RegisterType() )
    ->add('id', 'text')
    ->add('firstName', 'text')
    ->add('lastName', 'text')
    ->add('email', 'password')
    ->add('password', 'text');
    $form = $builder->getForm();
    return $app['twig']->render('register.twig', array('form' => $form->createView()));
});


$app->run();

我得到以下错误：

细枝错误运行时：变量“已禁用”不存在。

堆栈跟踪非常大，但以下是前两个条目：

>

{% block widget_attributes %}
{% spaceless %}
id="{{ id }}" name="{{ full_name }}"{% if read_only %} readonly="readonly"{% endif %}{%     if disabled %} disabled="disabled"{% endif %}{% if required %} required="required"{% endif     %}{% if max_length %} maxlength="{{ max_length }}"{% endif %}{% if pattern %} pattern="{{     pattern }}"{% endif %}
    {% for attrname,attrvalue in attr %}{{attrname}}="{{attrvalue}}" {% endfor %}
{% endspaceless %}
{% endblock widget_attributes %}

{% extends "base.twig" %}

{% block title %}Welcome to Nuts.co.uk{% endblock %}
{% block head %}
{{ parent() }}
{% endblock %}
{% block content %}

<div class="row">
<div class="span12">
    <h2>Register</h2>
    <p>
        Register for Nuts.co.uk and we'll give you free access to cool stuff
        in addition you can subscribe to our premium content.
    </p>

    
    
    <form  action="/contact" method="post">
        <fieldset >
            <legend>Contact</legend>

              {{ form_errors(form) }}
              {{ form_row(form.firstName) }}
              {{ form_row(form.lastName) }}
              {{ form_row(form.email) }}
              {{ form_row(form.password) }}

            <button type="submit" class="btn btn-info">Send</button>

        </fieldset>
    </form>
</div>
</div>


{% endblock %}