--- a/mercurial/localrepo.py	Mon Apr 21 20:04:54 2014 -0700
+++ b/mercurial/localrepo.py	Mon Apr 21 17:51:58 2014 -0700
@@ -134,7 +134,7 @@
                 ret = bundle2.unbundle20(self.ui, stream)
             return ret
         except error.PushRaced, exc:
-            raise error.ResponseError(_('push failed:'), exc.message)
+            raise error.ResponseError(_('push failed:'), str(exc))
 
     def lock(self):
         return self._repo.lock()