ValueError: cannot find context for 'fork'. (Windows)

[gety9]

Windows 10
Python 3.8.3

Running python beangrow/compute_returns.py b.beancount conf-returns out results in error:

Traceback (most recent call last):
  File "beangrow/compute_returns.py", line 105, in <module>
    main()
  File "beangrow/compute_returns.py", line 86, in main
    pricer = reports.generate_reports(account_data_map, config,
  File "R:\b\b-office\beangrow\reports.py", line 459, in generate_reports
    multiprocessing.set_start_method('fork')
  File "C:\Users\Btycoon\AppData\Local\Programs\Python\Python38\lib\multiprocessing\context.py", line 247, in set_start_method
    self._actual_context = self.get_context(method)
  File "C:\Users\Btycoon\AppData\Local\Programs\Python\Python38\lib\multiprocessing\context.py", line 239, in get_context
    return super().get_context(method)
  File "C:\Users\Btycoon\AppData\Local\Programs\Python\Python38\lib\multiprocessing\context.py", line 193, in get_context
    raise ValueError('cannot find context for %r' % method) from None
ValueError: cannot find context for 'fork'

Apparently caused by https://stackoverflow.com/a/46021480

Temporary fixed it by adjusting reports.py
multiprocessing.set_start_method('fork') changed to
multiprocessing.set_start_method('spawn')
(solution taken from here woven-planet/l5kit#129 (comment))

[floatingheads]

@gety9 this is exactly what I did as well.