Почему у меня возникает ошибка?

Есть такой код:

class Super_cls:

    def run(self):
        res = input('запуск всех- all,  одного любое значение\n')
        if res in ['all', 'a', 'все']:
            di = Factory('all')
            for key, val in di.items():
                if key in ['bitcoin', 'crypto']:
                    proc = multiprocessing.Process(target=self.cls_pack, args=(val, key))
                    proc.start()
                else:
                    proc = multiprocessing.Process(target=self.cls_pack, args=(val,))
                    proc.start()
        else:
            clss = Factory(res)
            if clss:
                p_res = clss()
                p_res.run()
            else:
                print('неверно введено значение')

    def cls_pack(self, cls, val=None):
        if val:
            p_res = cls(val)
        else:
            p_res = cls()
        p_res.run()


if __name__ == '__main__':
    m = Super_cls()
    m.run()

И есть класс Factory:

def Factory(res):
    factory_di = {
        'bitcoin': Git_parser,
        'crypto': Git_parser,
        'bitcoin_com': Bitcoin_com,
        'b_charts': B_charts,
        'b_talk2': B_talk2,
        'b_garden': B_garden,
        'St_exchange': St_exchange,
        'bit_forum': Bit_forum,
        'bit_forum2': Bit_forum2,
        'bitcoin_forum': Bf_com,
    }
    if res == 'all':
        return factory_di
    else:
        return factory_di.get(res)

Но появляются вот такая ошибка:

Traceback (most recent call last):
File "/Users/aleksandr/Downloads/parsers/Main.py", line 64, in
m.run()
File "/Users/aleksandr/Downloads/parsers/Main.py", line 42, in run
proc.start()
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/process.py", line 121, in start
self._popen = self._Popen(self)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/context.py", line 224, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/context.py", line 284, in _Popen
return Popen(process_obj)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/popen_spawn_posix.py", line 32, in __init__
super().__init__(process_obj)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/popen_fork.py", line 19, in __init__
self._launch(process_obj)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/popen_spawn_posix.py", line 47, in _launch
reduction.dump(process_obj, fp)
File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/reduction.py", line 60, in dump
ForkingPickler(file, protocol).dump(obj)
TypeError: cannot pickle '_thread.lock' object