{% with messages = get_flashed_messages() %}
{% for message in messages %}
{% if category == 'error' %}
{{ flash(title='Error - Login Error', text=message, color='is-danger') }}
{% else %}
{# Will work fine for most other flashed messages #}
{{ flash(title='Info', text=message, color='is-info' )}}
{% endif %}
{% endfor %}
{% endwith %}
{% for formerror in form.username.errors %}
{{ flash(title='Error - Username', text=formerror, color='is-danger') }}
{% endfor %}
{% for formerror in form.password.errors %}
{{ flash(title='Error - Password', text=formerror, color='is-danger') }}
{% endfor %}