Kernel Error

[Stevenvig]

Anyone know what this error is?

Traceback (most recent call last):
File "C:\Anaconda\lib\site-packages\tornado\web.py", line 1699, in _execute
result = await result
File "C:\Anaconda\lib\site-packages\tornado\gen.py", line 742, in run
yielded = self.gen.throw(*exc_info) # type: ignore
File "C:\Anaconda\lib\site-packages\notebook\services\sessions\handlers.py", line 72, in post
type=mtype))
File "C:\Anaconda\lib\site-packages\tornado\gen.py", line 735, in run
value = future.result()
File "C:\Anaconda\lib\site-packages\tornado\gen.py", line 742, in run
yielded = self.gen.throw(*exc_info) # type: ignore
File "C:\Anaconda\lib\site-packages\notebook\services\sessions\sessionmanager.py", line 88, in create_session
kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)
File "C:\Anaconda\lib\site-packages\tornado\gen.py", line 735, in run
value = future.result()
File "C:\Anaconda\lib\site-packages\tornado\gen.py", line 742, in run
yielded = self.gen.throw(*exc_info) # type: ignore
File "C:\Anaconda\lib\site-packages\notebook\services\sessions\sessionmanager.py", line 101, in start_kernel_for_session
self.kernel_manager.start_kernel(path=kernel_path, kernel_name=kernel_name)
File "C:\Anaconda\lib\site-packages\tornado\gen.py", line 735, in run
value = future.result()
File "C:\Anaconda\lib\site-packages\tornado\gen.py", line 209, in wrapper
yielded = next(result)
File "C:\Anaconda\lib\site-packages\notebook\services\kernels\kernelmanager.py", line 168, in start_kernel
super(MappingKernelManager, self).start_kernel(**kwargs)
File "C:\Anaconda\lib\site-packages\jupyter_client\multikernelmanager.py", line 110, in start_kernel
km.start_kernel(**kwargs)
File "C:\Anaconda\lib\site-packages\jupyter_client\manager.py", line 240, in start_kernel
self.write_connection_file()
File "C:\Anaconda\lib\site-packages\jupyter_client\connect.py", line 547, in write_connection_file
kernel_name=self.kernel_name
File "C:\Anaconda\lib\site-packages\jupyter_client\connect.py", line 212, in write_connection_file
with secure_write(fname) as f:
File "C:\Anaconda\lib\contextlib.py", line 112, in enter
return next(self.gen)
File "C:\Anaconda\lib\site-packages\jupyter_client\connect.py", line 100, in secure_write
win32_restrict_file_to_user(fname)
File "C:\Anaconda\lib\site-packages\jupyter_client\connect.py", line 61, in win32_restrict_file_to_user
sd = win32security.GetFileSecurity(fname, win32security.DACL_SECURITY_INFORMATION)
pywintypes.error: (50, 'GetFileSecurity', 'The request is not supported.')

[kevin-bates]

This appears to be a snafu with the pywin32 package. You might try looking at #4980.

Given your traceback, I would try upgrading notebook.

pip install notebook --upgrade

or, for conda envs,

conda update -c conda-forge notebook

Once completed, ensure that jupyter_client and jupyter_core have versions 5.3.4 and 4.6.3, respectively.

Once jupyter_core is on 4.6.3, there's another option that can bypass the pywin32 issue by setting JUPYTER_ALLOW_INSECURE_WRITES=true, but that should be a last resort and only if security is not paramount.

[kevin-bates]

Closing this issue. We can re-open if this is still a problem and the recommendations were not sufficient.