--- a/pvl/verkko/rrd.py	Sun Jan 20 22:46:17 2013 +0200
+++ b/pvl/verkko/rrd.py	Mon Jan 21 14:23:34 2013 +0200
@@ -148,7 +148,7 @@
             self.target = target
 
         except ValueError as ex :
-            raise web.NotFound(tree, target)
+            raise web.NotFound(tree + '/' + target)
 
     def render_interval (self, interval, style='detail') :
         """