implementation error

[animedhruv]

Traceback (most recent call last):
File "c:\users\dell\python\python38-32\lib\runpy.py", line 193, in _run_module_as_main
return _run_code(code, main_globals, None,
File "c:\users\dell\python\python38-32\lib\runpy.py", line 86, in run_code
exec(code, run_globals)
File "C:\Users\Dell\Python\Python38-32\Scripts\jupyter-notebook.EXE_main.py", line 7, in
File "c:\users\dell\python\python38-32\lib\site-packages\jupyter_core\application.py", line 268, in launch_instance
return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
File "c:\users\dell\python\python38-32\lib\site-packages\traitlets\config\application.py", line 663, in launch_instance
app.initialize(argv)
File "<c:\users\dell\python\python38-32\lib\site-packages\decorator.py:decorator-gen-7>", line 2, in initialize
File "c:\users\dell\python\python38-32\lib\site-packages\traitlets\config\application.py", line 87, in catch_config_error
return method(app, *args, **kwargs)
File "c:\users\dell\python\python38-32\lib\site-packages\notebook\notebookapp.py", line 1720, in initialize
self.init_webapp()
File "c:\users\dell\python\python38-32\lib\site-packages\notebook\notebookapp.py", line 1482, in init_webapp
self.http_server.listen(port, self.ip)
File "c:\users\dell\python\python38-32\lib\site-packages\tornado\tcpserver.py", line 152, in listen
self.add_sockets(sockets)
File "c:\users\dell\python\python38-32\lib\site-packages\tornado\tcpserver.py", line 165, in add_sockets
self._handlers[sock.fileno()] = add_accept_handler(
File "c:\users\dell\python\python38-32\lib\site-packages\tornado\netutil.py", line 279, in add_accept_handler
io_loop.add_handler(sock, accept_handler, IOLoop.READ)
File "c:\users\dell\python\python38-32\lib\site-packages\tornado\platform\asyncio.py", line 99, in add_handler
self.asyncio_loop.add_reader(fd, self._handle_events, fd, IOLoop.READ)
File "c:\users\dell\python\python38-32\lib\asyncio\events.py", line 501, in add_reader
raise NotImplementedError
NotImplementedError

Getting this while trying to open jupyter notebook

[jasongrout]

This is a python 3.8 compatibility issue. See #4613, fixed in #5047 and awaiting release.