these lines cause an error

src/common/xmpp/transports.py

@@ -204,8 +204,8 @@ def plugout(self,now=0):
         """ Unregisters TLS handler's from owner's dispatcher. Take note that encription
             can not be stopped once started. You can only break the connection and start over."""
         self._owner.UnregisterHandler('features',self.FeaturesHandler,xmlns=NS_STREAMS)
-        self._owner.UnregisterHandlerOnce('proceed',self.StartTLSHandler,xmlns=NS_TLS)
-        self._owner.UnregisterHandlerOnce('failure',self.StartTLSHandler,xmlns=NS_TLS)
+#        self._owner.UnregisterHandlerOnce('proceed',self.StartTLSHandler,xmlns=NS_TLS)
+#        self._owner.UnregisterHandlerOnce('failure',self.StartTLSHandler,xmlns=NS_TLS)
 
     def FeaturesHandler(self, conn, feats):
         """ Used to analyse server <features/> tag for TLS support.