% diff -u base.rb\~ base.rb
--- base.rb~    2006-08-10 13:33:17.000000000 -0500
+++ base.rb     2006-08-15 13:00:38.000000000 -0500
@@ -943,7 +943,7 @@
         elsif template_exists? && template_public?
           render
         else
-          raise UnknownAction, "No action responded to #{action_name}", caller
+          raise UnknownAction, "No action responded to #{action_name} within #{self.class}", caller
         end
       end