Programming error which causes a crash when closing and restarting the same ubuntu user session

Binary package hint: cohoba

The following programming error is reported, and cohoba-applet is not displayed in the bar (I think is has crashed, but something like that is only reported at the following computer launch)

Traceback (most recent call last):
  File "/usr/lib/cohoba/cohoba-applet", line 88, in <lambda>
    factory_callback = lambda applet, iid: CohobaFactory().make_applet(applet, iid, COHOBA_APPLET_MODE_MAIN)
  File "/usr/lib/python2.5/site-packages/cohoba/CohobaFactory.py", line 22, in make_applet
    from cohoba.applet.CohobaApplet import CohobaApplet
  File "/usr/lib/python2.5/site-packages/cohoba/applet/CohobaApplet.py", line 4, in <module>
    from cohoba.applet.CohobaAppletWidget import CohobaMainIconAppletWidget
  File "/usr/lib/python2.5/site-packages/cohoba/applet/CohobaAppletWidget.py", line 25, in <module>
    from cohoba.contacts.MergedContactList import get_contact_list, MergedContactList
  File "/usr/lib/python2.5/site-packages/cohoba/contacts/MergedContactList.py", line 22, in <module>
    from cohoba.contacts.Contact import Contact
  File "/usr/lib/python2.5/site-packages/cohoba/contacts/Contact.py", line 30, in <module>
    from cohoba.common.DBusProxyProvider import get_proxy_provider
  File "/usr/lib/python2.5/site-packages/cohoba/common/DBusProxyProvider.py", line 3, in <module>
    SESSION_BUS = dbus.SessionBus()
  File "/var/lib/python-support/python2.5/dbus/_dbus.py", line 669, in __new__
    mainloop=mainloop)
  File "/var/lib/python-support/python2.5/dbus/_dbus.py", line 293, in __new__
    mainloop=mainloop)
DBusException: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket /tmp/dbus-uyFOeoEl3f: Connexion refusée