AttributeError: LogFileObserver instance has no attribute '_logFile'

[Zooko]

$ FLOGFILE=flog.out.bz2 FLOGLEVEL=1 FLOGTOTWISTED=1 PYTHONPATH=support/lib/python2.6/site-packages/ trial --until-failure --rterror allmydata.test.test_hung_server.HungServerDownloadTest.test_2_good_8_bro
ken_copied_share
Thu Sep  2 23:47:50 MDT 2010
Test Pass 1
allmydata.test.test_hung_server
  HungServerDownloadTest
    test_2_good_8_broken_copied_share ...                                  [OK]

-------------------------------------------------------------------------------
Ran 1 tests in 1.634s

PASSED (successes=1)
Test Pass 2
allmydata.test.test_hung_server
  HungServerDownloadTest
    test_2_good_8_broken_copied_share ... Traceback (most recent call last):
  File "/Library/Python/2.6/site-packages/foolscap-0.5.1-py2.6.egg/foolscap/eventual.py", line 26, in _turn
    cb(*args, **kwargs)
  File "/Library/Python/2.6/site-packages/foolscap-0.5.1-py2.6.egg/foolscap/logging/log.py", line 440, in msg
    pickle.dump(e, self._logFile, 2)
exceptions.AttributeError: LogFileObserver instance has no attribute '_logFile'
[ERROR]
Traceback (most recent call last):
  File "/Library/Python/2.6/site-packages/foolscap-0.5.1-py2.6.egg/foolscap/eventual.py", line 26, in _turn
    cb(*args, **kwargs)
  File "/Library/Python/2.6/site-packages/foolscap-0.5.1-py2.6.egg/foolscap/logging/log.py", line 440, in msg
    pickle.dump(e, self._logFile, 2)
exceptions.AttributeError: LogFileObserver instance has no attribute '_logFile'
[ERROR]
Traceback (most recent call last):
  File "/Library/Python/2.6/site-packages/foolscap-0.5.1-py2.6.egg/foolscap/eventual.py", line 26, in _turn
    cb(*args, **kwargs)
  File "/Library/Python/2.6/site-packages/foolscap-0.5.1-py2.6.egg/foolscap/logging/log.py", line 440, in msg
    pickle.dump(e, self._logFile, 2)
exceptions.AttributeError: LogFileObserver instance has no attribute '_logFile'
[ERROR]
Traceback (most recent call last):
  File "/Library/Python/2.6/site-packages/foolscap-0.5.1-py2.6.egg/foolscap/eventual.py", line 26, in _turn
    cb(*args, **kwargs)
  File "/Library/Python/2.6/site-packages/foolscap-0.5.1-py2.6.egg/foolscap/logging/log.py", line 440, in msg
    pickle.dump(e, self._logFile, 2)
exceptions.AttributeError: LogFileObserver instance has no attribute '_logFile'
[ERROR]
Traceback (most recent call last):
  File "/Library/Python/2.6/site-packages/foolscap-0.5.1-py2.6.egg/foolscap/eventual.py", line 26, in _turn
    cb(*args, **kwargs)
  File "/Library/Python/2.6/site-packages/foolscap-0.5.1-py2.6.egg/foolscap/logging/log.py", line 440, in msg
    pickle.dump(e, self._logFile, 2)
exceptions.AttributeError: LogFileObserver instance has no attribute '_logFile'

... etc.