extract descriptions: exception "'module' object has no attribute '_parse'"

[nealmcb]

When I select a device, and choose "extract device and service descriptions" from the right button menu, I get an error to stdout like this. It happened for each of two devices I tried, with just minor variations in the output.

extract xml descriptions <gtk.MenuItem object at 0x7f1714d82f00 (GtkMenuItem at 0x27c9f10)>
 rootdevice u'PK5001Z' 'uuid:26158e50-979d-11e6-9d37-fcf528977abb'
 'upnp:rootdevice' '192.168.0.1', manifestation 'remote'
<gtk.Button object at 0x7f1714d82f00 (GtkButton at 0x273e720)> False
d FilePath('/tmp/26158e50-979d-11e6-9d37-fcf528977abb/device-description.xml')
 /tmp/26158e50-979d-11e6-9d37-fcf528977abb/device-description.xml
problem creating download directory: <type 'exceptions.Exception'>
 ('module' object has no attribute '_parse')