From 8e4c020f8fb3373f5f2144d00fe52336a77e4008 Mon Sep 17 00:00:00 2001
From: James Turk <james.p.turk@gmail.com>
Date: Wed, 7 Mar 2012 11:07:30 -0500
Subject: [PATCH] better error on duplicate

---
 oyster/core.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/oyster/core.py b/oyster/core.py
index 405491e..2b906e2 100644
--- a/oyster/core.py
+++ b/oyster/core.py
@@ -111,7 +111,8 @@ class Kernel(object):
             else:
                 self.log('track', url=url, error='tracking conflict')
                 raise ValueError('%s is already tracked with different '
-                                 'metadata' % url)
+                                 'metadata: (tracked: %r) (new: %r)' %
+                                 (url, tracked['metadata'], kwargs)
 
         self.log('track', url=url)