مشکل در اجرای اسکریپت

سلام وقتتون بخیر من یک اسکریپت مدیریت گروه روبیکا اجرا میکنم و ارور زیر رو دریافت میکنم

Traceback (most recent call last):
  File "/data/user/0/ru.iiec.pydroid3/files/accomp_files/iiec_run/iiec_run.py", line 31, in <module>
    start(fakepyfile,mainpyfile)
  File "/data/user/0/ru.iiec.pydroid3/files/accomp_files/iiec_run/iiec_run.py", line 30, in start
    exec(open(mainpyfile).read(),  main.dict)
  File "<string>", line 5, in <module>
  File "/data/user/0/ru.iiec.pydroid3/files/arm-linux-androideabi/lib/python3.11/site-packages/rubika/client.py", line 68, in init
    privateKey = loads(b64decode(privateKey).decode('utf-8'))['d']
                       ^^^^^^^^^^^^^^^^^^^^^
  File "/data/user/0/ru.iiec.pydroid3/files/arm-linux-androideabi/lib/python3.11/base64.py", line 83, in b64decode
    s = _bytes_from_decode_data(s)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/user/0/ru.iiec.pydroid3/files/arm-linux-androideabi/lib/python3.11/base64.py", line 45, in _bytes_from_decode_data
    raise TypeError("argument should be a bytes-like object or ASCII "
TypeError: argument should be a bytes-like object or ASCII string, not 'NoneType'