Extend layout error?

[Sblash]

Hi, i'm using Symfony 4.3
When i exends the @SonataAdmin/Form/form_admin_fields.html.twig template, i add

{% block burgov_key_value_widget %}
{{- block('sonata_type_native_collection_widget') -}}
{% endblock %}

but then there is an error

Variable "compound" does not exist.

some help?