Unable getting keys

[Sei969]

Hello, please can you point me in the right direction to fix this issue?
Two Python instances installed on my Windows PC: python36 and python39.

Thank you!

[info] Attempting Widevine challenge...
[info] Getting Keys...
Traceback (most recent call last):
  File "C:\Users\Desktop\NARROWVINE-REBORN\narrowvine-reborn-master\narrowvine_reborn.py", line 235, in <module>
    KEYS = do_decrypt(licurl=licurl, kid=get_kid(),headers=headers)
  File "C:\Users\Desktop\NARROWVINE-REBORN\narrowvine-reborn-master\narrowvine_reborn.py", line 162, in do_decrypt
    wvdecrypt = WvDecrypt(pssh)
  File "C:\Users\xxxx\AppData\Local\Programs\Python\Python39\lib\pywidevine\decrypt\wvdecrypt.py", line 19, in __init__
    self.logger.debug(self.log_message("wvdecrypt object created"))
  File "C:\Users\xxxx\AppData\Local\Programs\Python\Python39\lib\pywidevine\decrypt\wvdecrypt.py", line 47, in log_message
    return "{}_{} : {}".format(self.config.tracktype, self.config.trackno, msg)
AttributeError: 'str' object has no attribute 'tracktype'