Traceback (most recent call last):
  File "/usr/local/bin/check50", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.7/dist-packages/check50/__main__.py", line 379, in main
    check_results = check_runner.run(args.target)
  File "/usr/local/lib/python3.7/dist-packages/check50/runner.py", line 201, in run
    result, state = future.result()
  File "/usr/lib/python3.7/concurrent/futures/_base.py", line 428, in result
    return self.__get_result()
  File "/usr/lib/python3.7/concurrent/futures/_base.py", line 384, in __get_result
    raise self._exception
  File "/usr/lib/python3.7/multiprocessing/queues.py", line 236, in _feed
    obj = _ForkingPickler.dumps(obj)
  File "/usr/lib/python3.7/multiprocessing/reduction.py", line 51, in dumps
    cls(buf, protocol).dump(obj)
_pickle.PicklingError: Can't pickle <function <lambda> at 0x7ff58294add0>: attribute lookup <lambda> on cs50.cs50 failed