Traceback (most recent call last):

  File "/usr/lib/python2.5/site-packages/roundup/cgi/client.py", line
303, in inner_main
    html = self.handle_action()

  File "/usr/lib/python2.5/site-packages/roundup/cgi/client.py", line
879, in handle_action
    return action_klass(self).execute()

  File "/usr/lib/python2.5/site-packages/roundup/cgi/actions.py", line
39, in execute
    return self.handle()

  File "/usr/lib/python2.5/site-packages/roundup/cgi/actions.py", line
1074, in handle
    row.append(str(klass.get(itemid, name)))

  File
"/usr/lib/python2.5/site-packages/roundup/backends/rdbms_common.py",
line 1530, in get
    prop = self.properties[propname]

KeyError: 'title%2Cid%2Cactivity%2Cstatus'

What does it mean, and how do I prevent it from happening again?