Exception while rendering form to insert new entity [symfony2] - symfony

Question

I have problem to render view for creating new entity and can't find existing problem here being answered so I am going to ask...
My app has entity X that belongs to one entity Y and can have many entities Z.
When console runs, it executes well with all those relations.
php app\console doctrine:schema:update --force,
After crud generating for entity X, listing page shows fine, but page for creating new record throws following exception:
An exception has been thrown during the rendering of a template
("Warning: call_user_func_array() expects parameter 1 to be a valid
callback, class 'Symfony\Bridge\Twig\Extension\FormExtension' does not
have a method 'renderer->humanize' in
%path_to_app%\app\cache\dev\twig\16\16033db1d32d7d10db7a0d24db2f49938a4b2e9a63d231d90bf70d1969563fd0.php
line 880") in form_div_layout.html.twig at line 232.
What could be the problem?
Update 1:
Exception's trigger lays in twig file where data is passed from controller.
At {{ form_widget(form) }}
Update 2:
//controller's method
/**
*
*
* #Route("/new", name="class_new")
* #Template()
*/
public function newAction()
{
$entity = new Class();
$form = $this->createForm(new ClassType(), $entity);
return array(
'entity' => $entity,
'form' => $form->createView(),
);
}
//Form class
class ClassType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name')
;
}
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Admin\MainBundle\Entity\Class'
));
}
public function getName()
{
return 'admin_mainbundle_classtype';
}
}
// view
<form action="{{ path('class_create') }}" method="post" {{ form_enctype(form) }}>
{{ form_widget(form) }}
<p>
<button type="submit">Create</button>
</p>
</form>

Answer 1

Try to empty the cache : php bin/console cache:clear and rerun your command.
If problem persit: look at in your controller if you are used a undefined function for exemple renderer->humanize and look layout.html.twig at line 232.

Answer 2

I don't see any problem in your controller and view.
So i tried to look for in form_div_layout.html.twig file and i found that function humanize is used there and the exception says that function isn't defined.
So can you update your project by : composer install
form_div_layout.html.twig :
{%- block form_label -%}
{% if label is not same as(false) -%}
{% if not compound -%}
{% set label_attr = label_attr|merge({'for': id}) %}
{%- endif -%}
{% if required -%}
{% set label_attr = label_attr|merge({'class': (label_attr.class|default('') ~ ' required')|trim}) %}
{%- endif -%}
{% if label is empty -%}
{%- if label_format is not empty -%}
{% set label = label_format|replace({
'%name%': name,
'%id%': id,
}) %}
{%- else -%}
{% set label = name|humanize %}
{%- endif -%}
{%- endif -%}
<label{% for attrname, attrvalue in label_attr %} {{ attrname }}="{{ attrvalue }}"{% endfor %}>{{ translation_domain is same as(false) ? label : label|trans({}, translation_domain) }}</label>
{%- endif -%}
{%- endblock form_label -%}
{%- block button_label -%}{%- endblock -%}

Answer 3

I solved this few weeks ago but now I spotted time for answering.
This was giving me headache before moving the app version from 2.1 to 2.8. Nowadays it works well.