<% nice_source = req.error.backtrace[0].match(/^(.+?):(\d+)(|:in `(.+)')$/) file = nice_source[1].gsub(File.expand_path(Config.app.root) + '/', '') line = nice_source[2] msg = CGI.escapeHTML("#{req.error.class}: #{req.error}") trace = req.error.backtrace.map { |bt| CGI.escapeHTML(bt) }.join('
') %>

Pakyow found something wrong :(

The error originated on line <%=line%> of <%=file%>.

<%=msg%>

  <%=trace%>