app/views/shared/_errors.html.erb
<% if errors.any? %>
<div id="error_explanation">
<h3>
<% if errors.size == 1 %>
One minor thing looks off:
<% else %>
Please fix the following:
<% end %>
</h3>
<ol>
<% errors.each do |error| %>
<li><%= error.full_message %></li>
<% end %>
</ol>
</div>
<% end %>