I've a problem......

[NSH531]

how to solve this.....???
(I attached traceback & source code)

service=rauth.OAuth2Service(client_id=client_id,client_secret=secret,base_url="https://api.crowdstrike.com/")

tr=""
data={"token": f"{tr}"}
def get_access_token(service):
        session = service.get_auth_session(data=data, decoder=json.loads)
        access_token = session.access_token
        tr=access_token

session = service.get_auth_session(data=data, decoder=json.loads)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\netanelst\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\rauth\service.py", line 556, in get_auth_session
    session = self.get_session(self.get_access_token(method, **kwargs))
  File "C:\Users\netanelst\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\rauth\service.py", line 541, in get_access_token
    r = self.get_raw_access_token(method, **kwargs)
  File "C:\Users\netanelst\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\rauth\service.py", line 516, in get_raw_access_token
    self.access_token_response = session.request(method,
  File "C:\Users\netanelst\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\rauth\session.py", line 345, in request
    url = self._set_url(url)
  File "C:\Users\netanelst\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\rauth\session.py", line 40, in _set_url
    not absolute_url(url):
  File "C:\Users\netanelst\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\rauth\utils.py", line 20, in absolute_url
    return url.startswith(('http://', 'https://'))
AttributeError: 'NoneType' object has no attribute 'startswith'

thanks
Netanel