Can't use ProcessPool in pycharm on windows

[Blanket58]

When I type the following in pycharm console, it comes with os error, but everything is normal under cmd and ipython, I've been struggling with this problem for a long time.

from pathos.multiprocessing import ProcessPool

ProcessPool(2)

<pool ProcessPool(ncpus=2)>
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "D:\Python\lib\site-packages\multiprocess\spawn.py", line 105, in spawn_main
    exitcode = _main(fd)
  File "D:\Python\lib\site-packages\multiprocess\spawn.py", line 114, in _main
    prepare(preparation_data)
  File "D:\Python\lib\site-packages\multiprocess\spawn.py", line 225, in prepare
    _fixup_main_from_path(data['init_main_from_path'])
  File "D:\Python\lib\site-packages\multiprocess\spawn.py", line 277, in _fixup_main_from_path
    run_name="__mp_main__")
  File "D:\Python\lib\runpy.py", line 261, in run_path
Traceback (most recent call last):
  File "<string>", line 1, in <module>
    code, fname = _get_code_from_file(run_name, path_name)
  File "D:\Python\lib\runpy.py", line 231, in _get_code_from_file
    with open(fname, "rb") as f:
OSError: [Errno 22] Invalid argument: 'D:\\myworkspace\\<input>'

My working environment:
python 3.7.7 64bit
windows10 x64
pycharm 2019.3.5 pro
pathos 0.2.6