Form theming problem.

fields.html.twig

{% extends 'form_div_layout.html.twig' %}

{% block TrouveTout_Element_widget %}
{% spaceless %}
{{ parent() }}

<div class="enligne">
  {% for child in form.children %}
  {% if child.name == 'childElement' %}
  {{ form_row(child) }}
  {% endif %}
  {% endfor %}
</div>

<div class="enligne">
  {{ form_rest(form) }}
</div>

{% endspaceless %}
{% endblock %}

{% block TrouveTout_Caract_widget %}
{% spaceless %}
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{{ parent() }}

{{ form_row(form.name) }}
{{ form_row(form.type) }}
{% if form.value is defined %}
{{ form_row(form.value) }}
{% endif %}


{% if image is defined %}
<img src="{{ asset('img/')}}{{image}}" alt="caract image: {{image}}" height="100" width="100">
{% endif %}

{% if objects is defined %}
{% for object in objects %}
<a href="{{ path('edit_concept', {id: object.id}) }}">{{object.name}}</a>/
{% endfor %}
{% endif %}

<div class="enligne">
{% if form.prefix is defined %}
  {{ form_row(form.prefix) }}
  {{ form_row(form.unit) }}
{% endif %}
</div>

{{ form_rest(form) }}
{% endspaceless %}
{% endblock %}

{% block TrouveTout_ConceptConcept_widget %}
{% spaceless %}
{{ parent() }}

{{ form_row(form.moreGeneral) }}

{% if categoryName is defined %}
<a href="{{ path('edit_concept', {id: categoryId}) }}">{{categoryName}}</a>
{% endif %}

{{ form_rest(form) }}
{% endspaceless %}
{% endblock %}

{% block TrouveTout_Set_widget %}
{% spaceless %}
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{{ parent() }}
{% set attr = attr|merge({'prototype_specify_name': form_row(prototype_specify_name) }) %}
{% endspaceless %}
{% endblock %}

{% block TrouveTout_Category_widget %}
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{{ parent() }}
{% set attr = attr|merge({'prototype_specify_name': form_row(prototype_specify_name) }) %}
{% endblock %}

{% block TrouveTout_Research_widget %}
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{{ parent() }}
{% set attr = attr|merge({'prototype_specify_name': form_row(prototype_specify_name) }) %}
{% endblock %}

SetType.php

class SetType extends ConceptType
{
    …

    public function getName()
    {
        return 'TrouveTout_Set';
    }
}