Error launching Jupyter Notebook from Anaconda Navigator

General
1

Traceback (most recent call last):
File “C:\ProgramData\anaconda3\Scripts\jupyter-notebook-script.py”, line 6, in
from notebook.app import main
File “C:\ProgramData\anaconda3\Lib\site-packages\notebook\app.py”, line 12, in
from jupyter_server.base.handlers import JupyterHandler
File “C:\ProgramData\anaconda3\Lib\site-packages\jupyter_server\base\handlers.py”, line 25, in
from tornado import web
File “”, line 1229, in handle_fromlist
File "C:\ProgramData\anaconda3\Lib\site-packages\tornado_init.py", line 66, in getattr
return importlib.import_module(“.” + name, name)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “C:\ProgramData\anaconda3\Lib\importlib_init_.py”, line 126, in import_module
return _bootstrap.gcd_import(name[level:], package, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “C:\ProgramData\anaconda3\Lib\site-packages\tornado\web.py”, line 92, in
from tornado.httpserver import HTTPServer
File “C:\ProgramData\anaconda3\Lib\site-packages\tornado\httpserver.py”, line 32, in
from tornado.http1connection import HTTP1ServerConnection, HTTP1ConnectionParameters
File “C:\ProgramData\anaconda3\Lib\site-packages\tornado\http1connection.py”, line 34, in
from tornado import iostream
File “”, line 1229, in handle_fromlist
File "C:\ProgramData\anaconda3\Lib\site-packages\tornado_init.py", line 66, in getattr
return importlib.import_module(“.” + name, name)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\ProgramData\anaconda3\Lib\importlib_init.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “C:\ProgramData\anaconda3\Lib\site-packages\tornado\iostream.py”, line 40, in
from tornado.netutil import ssl_wrap_socket, _client_ssl_defaults, _server_ssl_defaults
File “C:\ProgramData\anaconda3\Lib\site-packages\tornado\netutil.py”, line 35, in
_client_ssl_defaults = ssl.create_default_context(ssl.Purpose.SERVER_AUTH)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File “C:\ProgramData\anaconda3\Lib\ssl.py”, line 775, in create_default_context
context.load_default_certs(purpose)
File “C:\ProgramData\anaconda3\Lib\ssl.py”, line 596, in load_default_certs
self._load_windows_store_certs(storename, purpose)
File “C:\ProgramData\anaconda3\Lib\ssl.py”, line 588, in _load_windows_store_certs
self.load_verify_locations(cadata=certs)
ssl.SSLError: [X509V3: INVALID_CERTIFICATE] invalid certificate (_ssl.c:4035)

2

Before trying anything, was it working before? Have you recently upgraded/updated and not restarted everything? Does JupyterLab work? If you haven’t invested a lot in environments on this machine yet, you may want to try uninstalling Anaconda and cleaning and reinstalling first.

You may want to see here or the latest ones here or this point in this thread and suggestions below there for some options to try.
(Someone posted a similar issue here last month that you may want to monitor, too.)