Symfony 2 Gregwar captcha_code doesn't exist exception - symfony

Question

I want to add Gregwar Bundle (captcha) to my project. I did all the steps shown here https://github.com/Gregwar/CaptchaBundle/blob/master/README.md
But, it is throwing "Variable "captcha_code" does not exist" exception. Is it smth wrong with the form theming part?

Answer 1

use tag form_theme
example:
index.html.twig - template with your form,
captcha.html.twig - template with your captcha
index.html.twig content:
{% form_theme form 'YourBundle::captcha.html.twig' %}
<form action="" method="post">
...
{{ form_widget(form.captcha) }}
...
</form>
captcha.html.twig content:
{% block captcha_widget %}
{% spaceless %}
<img src="{{ captcha_code }}" alt="" title="captcha" width="{{ captcha_width }}" height="{{ captcha_height }}" />
...
{{ form_widget(form, {'attr': { 'autocapitalize': 'off','autocorrect': 'off' }}) }}
...
{% endspaceless %}
{% endblock %}

Answer 2

Block captcha_widget has to be outside any other block, example:
{% block captcha_widget %}
{% set label = label|default('')|trim %}
{% if is_human %}
-
{% else %}
{% spaceless %}
<div class="image">
<img id="{{ image_id }}" src="{{ captcha_code }}" alt="" title="captcha" width="{{ captcha_width }}" height="{{ captcha_height }}" />
{% if reload %}
<script type="text/javascript">
function reload_{{ image_id }}() {
var img = document.getElementById('{{ image_id }}');
img.src = '{{ captcha_code }}?n=' + (new Date()).getTime();
}
</script>
<a class="captcha_reload" onclick="reload_{{ image_id }}(); return false;" href="#">{{ 'Renew'|trans({}, 'gregwar_captcha') }}</a>
{% endif %}
</div>
<div class="">{{ label }}{{ label ? '* :': ''}}{{ form_widget(form) }}</div>
{% endspaceless %}
{% endif %}
{% endblock captcha_widget %}
{% form_theme form2 _self %}
{% block content %}
...
{% endblock %}