Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/buildbot/steps/shell.py", line 207, in start
    self.startCommand(cmd, warnings)
  File "/usr/lib/python2.5/site-packages/buildbot/process/buildstep.py", line 993, in startCommand
    d = self.runCommand(cmd) # might raise ConnectionLost
  File "/usr/lib/python2.5/site-packages/buildbot/process/buildstep.py", line 935, in runCommand
    d = c.run(self, self.remote)
  File "/usr/lib/python2.5/site-packages/buildbot/process/buildstep.py", line 84, in run
    d = defer.maybeDeferred(self.start)
--- <exception caught here> ---
  File "/usr/lib/python2.5/site-packages/twisted/internet/defer.py", line 106, in maybeDeferred
    result = f(*args, **kw)
  File "/usr/lib/python2.5/site-packages/buildbot/process/buildstep.py", line 503, in start
    return LoggedRemoteCommand.start(self)
  File "/usr/lib/python2.5/site-packages/buildbot/process/buildstep.py", line 303, in start
    return RemoteCommand.start(self)
  File "/usr/lib/python2.5/site-packages/buildbot/process/buildstep.py", line 111, in start
    self.remote_command, self.args)
  File "/usr/lib/python2.5/site-packages/twisted/spread/pb.py", line 340, in callRemote
    _name, args, kw)
  File "/usr/lib/python2.5/site-packages/twisted/spread/pb.py", line 818, in _sendMessage
    raise DeadReferenceError("Calling Stale Broker")
twisted.spread.pb.DeadReferenceError: Calling Stale Broker