app/views/layouts/_errors.html.erb


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<% if model.errors.size.positive? %>
    <div class="notice">
        <% if model.errors.size == 1 %>
            <span><%= model.errors.first.full_message %>.</span>
        <% else %>
            <ul>
                <% model.errors.each do |error| %>
                    <li><%= error.full_message %>.</li>
                <% end %>
            </ul>
        <% end %>
    </div>
<% end %>