PreconditionFailed: (u'conflict', u'Document update conflict.')"

[paul jobs]

*   del anondb[messageid]*
  File
"/usr/lib/python2.5/site-packages/CouchDB-0.5-py2.5.egg/couchdb/client.py",
line 279, in __delitem__
    self.resource.delete(id, rev=resp['etag'].strip('"'))
  File
"/usr/lib/python2.5/site-packages/CouchDB-0.5-py2.5.egg/couchdb/client.py",
line 829, in delete
    return self._request('DELETE', path, headers=headers, **params)
  File
"/usr/lib/python2.5/site-packages/CouchDB-0.5-py2.5.egg/couchdb/client.py",
line 888, in _request
    raise PreconditionFailed(error)
PreconditionFailed: (u'conflict', u'Document update conflict.')" while
reading upstream, client: 69.63.176.233, server:

Any one see this error