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<!-- I see this commonly used but there's a better way  -->
{{ form.errors | default_errors }}

<!-- checking if there are errors -->
{% if form.errors %}{% endif %}

<!-- we can loop through each error and output them individually -->
{% for field in form.errors %}
	<li>{{ field | capitalize }}: {{ form.errors.messages[field] }}</li>
{% endfor %}

<!-- we can also output errors on each field using the name attr of the field -->
<input type="text"  name="contact[email]" />
{% if form.errors.messages.email > '' %}
  {{ form.errors.messages.email }}
{% endif %}