canvas-lms/app/views/errors/index.html.erb

<% 
  content_for :page_title, "Error Reports"
  add_crumb "Error Reports"
%>
<% @reports.each do |report| %>
  <div style="margin-bottom: 20px;">
    <h3><%= h(report.message) %></h3>
      <div style="border: 1px solid #eee; -moz-border-radius: 5px; padding: 5px 20px;">
      <%= h(report.url) %><br/>
      <% if report.user_id %>
        <%= link_to report.user.try(:name), user_url(report.user_id) %>
      <% end %>
      <pre style="font-size: 0.8em; margin-left: 20px; height: 150px; overflow: auto;">
        <%= h(report.backtrace) %>
      </pre>
    </div>
  </div>
<% end %>