Thermos runner fails if log rotation is enabled

ERROR] Caught exception in self.control(): Logger mode rotate is invalid.
ERROR]   Traceback (most recent call last):
  File "apache/thermos/core/runner.py", line 572, in control
    yield
  File "apache/thermos/core/runner.py", line 916, in run
    self._run()
  File "apache/thermos/core/runner.py", line 923, in _run
    iteration_wait = runner.run()
  File "apache/thermos/core/runner.py", line 291, in run
    launched = self.runner._run_plan(self.runner._regular_plan)
  File "apache/thermos/core/runner.py", line 843, in _run_plan
    self._set_process_status(process_name, ProcessState.WAITING)
  File "apache/thermos/core/runner.py", line 687, in _set_process_status
    self._dispatcher.dispatch(self._state, runner_ckpt, self._recovery)
  File "apache/thermos/common/ckpt.py", line 384, in dispatch
    self._run_process_dispatch(process_update.state, process_update)
  File "apache/thermos/common/ckpt.py", line 215, in _run_process_dispatch
    getattr(handler, handler_function)(process_update)
  File "apache/thermos/core/runner.py", line 106, in on_waiting
    process_update.process, process_update.seq + 1))
  File "apache/thermos/core/runner.py", line 723, in _task_process_from_process_name
    preserve_env=self._preserve_env)
  File "apache/thermos/core/process.py", line 348, in __init__
    ProcessBase.__init__(self, *args, **kw)
  File "apache/thermos/core/process.py", line 142, in __init__
    raise ValueError("Logger mode %s is invalid." % self._logger_mode)
ValueError: Logger mode rotate is invalid.