--- a/lookup.py	Mon Feb 16 03:15:14 2009 +0200
+++ b/lookup.py	Mon Jun 15 01:44:05 2009 +0300
@@ -102,7 +102,7 @@
                 break
 
         # did not find the filename we were looking for in os.listdir
-        raise map.MapperError(name)
+        raise NameError(name)
 
     def handle_request (self, request) :
         """