Forbidden loading

[hueryan]

When I click on nbextensions in the browser, the page keeps loading.

\anaconda3\envs\mathforpro\lib\site-packages\jupyter_server\base\handlers.py:611: UserWarning: The Tornado web application does not have an 'identity_provider' defined in its settings. In future releases of jupyter_server, this will be a required key for all subclasses of JupyterHandler. For an example, see the jupyter_server source code for how to add an identity provider to the tornado settings: https://github.com/jupyter-server/jupyter_server/blob/v2.0.0/jupyter_server/serverapp.py#L242
if type(self.identity_provider) is IdentityProvider and mod_obj.name != name:
[W 20:02:28.825 NotebookApp] [jupyter_nbextensions_configurator] wrote error: 'Forbidden'
Traceback (most recent call last):
File "D:\ProgramFiles\anaconda3\envs\mathforpro\lib\site-packages\tornado\web.py", line 1827, in _execute
result = await result # type: ignore
File "D:\ProgramFiles\anaconda3\envs\mathforpro\lib\site-packages\jupyter_server\base\handlers.py", line 754, in prepare
await super().prepare()
File "D:\ProgramFiles\anaconda3\envs\mathforpro\lib\site-packages\jupyter_server\base\handlers.py", line 646, in prepare
return web.authenticated(lambda : super().prepare())(self)
File "D:\ProgramFiles\anaconda3\envs\mathforpro\lib\site-packages\tornado\web.py", line 3363, in wrapper
url = self.get_login_url()
File "D:\ProgramFiles\anaconda3\envs\mathforpro\lib\site-packages\jupyter_server\base\handlers.py", line 786, in get_login_url
raise web.HTTPError(403)
tornado.web.HTTPError: HTTP 403: Forbidden
[W 20:02:28.829 NotebookApp] 403 GET /nbextensions/nbextensions_configurator/list?=1761825748615 (::1) 5.490000ms referer=http://localhost:8888/tree