File "/home/phil/devel/elisa/trunk/elisa/core/application.py", line 414, in skin_unloaded
            coherence.shutdown()
          File "/usr/lib/python2.5/site-packages/Coherence-0.2.2-py2.5.egg/coherence/base.py", line 261, in shutdown
            self.ssdp_server.shutdown()
          File "/usr/lib/python2.5/site-packages/Coherence-0.2.2-py2.5.egg/coherence/upnp/core/ssdp.py", line 62, in shutdown
            self.doByebye(st)
          File "/usr/lib/python2.5/site-packages/Coherence-0.2.2-py2.5.egg/coherence/upnp/core/ssdp.py", line 215, in doByebye
            self.transport.write('\r\n'.join(resp), (SSDP_ADDR, SSDP_PORT))
        exceptions.AttributeError: 'NoneType' object has no attribute 'write'