fix nattraverso imports

diff --git a/nattraverso/pynupnp/upnp.py b/nattraverso/pynupnp/upnp.py
index eae568f..1944b24 100644 (file)
--- a/nattraverso/pynupnp/upnp.py
+++ b/nattraverso/pynupnp/upnp.py
@@ -17,6 +17,7 @@ from twisted.internet import reactor, defer
 from twisted.web import client
 from twisted.internet.protocol import DatagramProtocol
 from twisted.internet.error import CannotListenError
+from twisted.python import failure
 
 from nattraverso.pynupnp.soap import SoapProxy
 from nattraverso.pynupnp.upnpxml import UPnPXml