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+<%# http://railscasts.com/episodes/211-validations-in-rails-3 %>
+<% if target.errors.any? %>
+<div id="error_explanation">
+ <h2><%= pluralize(target.errors.count, "error") %> prohibited this form from being submitted:</h2>
+ <ul>
+ <% target.errors.full_messages.each do |msg| %>
+ <li><%= msg %></li>
+ <% end %>
+ </ul>
+</div>
+<% end %>