app/views/shared/_error_messages.html.erb
<% if curr_object && curr_object.errors.size > 0 %>
<div id="error_explanation">
<h2><%= pluralize(curr_object.errors.size, "error") %> prohibited this record from being saved:</h2>
<ul>
<% curr_object.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>