Backup no longer works on Mac OS X (threading cannot release un-acquired lock)

[Rob Oakes]

  File "/Users/RobOakes/Developer/Time-Drive/timedrive/background/backupjob.py", line 235, in run
    self.doBackupJob(include, str(au.archiveUrl), str(au.gnuPassphrase))
  File "/Users/RobOakes/Developer/Time-Drive/timedrive/background/backupjob.py", line 171, in doBackupJob
    combinedExcludeList.extend(self.buildExcludeList(include.ExcludeList, folderName))
  File "/Users/RobOakes/Developer/Time-Drive/timedrive/background/backupjob.py", line 130, in buildExcludeList
    if self.isValidExclude(e, mountpoint):
  File "/Users/RobOakes/Developer/Time-Drive/timedrive/background/backupjob.py", line 63, in isValidExclude
    log.Error(str(mountpoint + exclude.Item) + " could not be found, ignoring")
  File "/Users/RobOakes/Developer/Time-Drive/timedrive/utils/log.py", line 50, in Error
    Log(msg, logging.ERROR)
  File "/Users/RobOakes/Developer/Time-Drive/timedrive/utils/log.py", line 57, in Log
    _logger.log(verb_level, msg.decode("utf8", "ignore"))
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 1084, in log
    self._log(level, msg, args, **kwargs)
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 1129, in _log
    self.handle(record)
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 1139, in handle
    self.callHandlers(record)
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 1176, in callHandlers
    hdlr.handle(record)
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 664, in handle
    self.release()
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/logging/__init__.py", line 618, in release
    self.lock.release()
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/threading.py", line 136, in release
    raise RuntimeError("cannot release un-aquired lock")

[Philippe Delodder (lodder)]

It's something in the logging facility as the last line of time drive code is:
File "/Users/RobOakes/Developer/Time-Drive/timedrive/utils/log.py", line 57, in Log
    _logger.log(verb_level, msg.decode("utf8", "ignore"))

The first call to the logging could be the problem:
File "/Users/RobOakes/Developer/Time-Drive/timedrive/background/backupjob.py", line 63, in isValidExclude
    log.Error(str(mountpoint + exclude.Item) + " could not be found, ignoring")

could you give me the content of the fields mountpoint and exclude.item as the error occurs?