I/O Errors when downloading manifest.

[DailyDreaming]

Running: https://github.com/uc-cdis/gen3sdk-python#download-manifest

Seems to generate a file, but launches 10 billion error messages that all say:

Traceback (most recent call last):
  File "/usr/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
ValueError: I/O operation on closed file.
Future exception was never retrieved
future: <Future finished exception=ValueError('I/O operation on closed file.')>

This is running with the default in the tutorial and also num_processes=1 & max_concurrent_requests=1 seems to give the same errors.