Errors from fabric tar/pipe script

errors.log

tar: Removing leading `/' from member names
tar: This does not look like a tar archive
tar: Exiting with failure status due to previous errors
Traceback (most recent call last):
  File "write_to_fifo.py", line 13, in <module>
    out_stream=reader_proc.stdin
  File "<decorator-gen-3>", line 2, in run
  File "/usr/local/lib/python3.5/dist-packages/fabric/connection.py", line 30, in opens
    return method(self, *args, **kwargs)
  File "/usr/local/lib/python3.5/dist-packages/fabric/connection.py", line 702, in run
    return self._run(self._remote_runner(), command, **kwargs)
  File "/usr/local/lib/python3.5/dist-packages/invoke/context.py", line 101, in _run
    return runner.run(command, **kwargs)
  File "/usr/local/lib/python3.5/dist-packages/invoke/runners.py", line 271, in run
    return self._run_body(command, **kwargs)
  File "/usr/local/lib/python3.5/dist-packages/invoke/runners.py", line 365, in _run_body
    raise ThreadException(thread_exceptions)
invoke.exceptions.ThreadException: 
Saw 1 exceptions within threads (TypeError):


Thread args: {'kwargs': {'buffer_': [],
            'hide': False,
            'output': <_io.BufferedWriter name=5>},
 'target': <bound method Runner.handle_stdout of <fabric.runners.Remote object at 0x7f3b84ef95f8>>}

Traceback (most recent call last):

  File "/usr/local/lib/python3.5/dist-packages/invoke/util.py", line 233, in run
    super(ExceptionHandlingThread, self).run()

  File "/usr/lib/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)

  File "/usr/local/lib/python3.5/dist-packages/invoke/runners.py", line 564, in handle_stdout
    buffer_, hide, output, reader=self.read_proc_stdout

  File "/usr/local/lib/python3.5/dist-packages/invoke/runners.py", line 537, in _handle_output
    self.write_our_output(stream=output, string=data)

  File "/usr/local/lib/python3.5/dist-packages/invoke/runners.py", line 525, in write_our_output
    stream.write(encode_output(string, self.encoding))

TypeError: a bytes-like object is required, not 'str'