Custom Form Error in Symfony 5 (form_errors)
While you can add attributes to form_label and form_widget to customise form_errors you have to use a template. Add a twig template "templates/form/form_errors.html.twig" Paste in the below {% block form_errors %} {% if errors|length > 0 %} <ul class="error_list"> {% for error in errors %} <li>{{ error.message }}</li> {% endfor %} </ul> {% endif %} {% endblock form_errors %} Edit "config/packages/twig.yaml" Add in the template details eg. twig: default_path: '%kernel.project_dir%/templates' form_themes: - 'form/form_errors.html.twig' Based on Symfony 2 instructions found here