Kernel error

[Nemo900]

Hi,
I have a kernel error using jupyter through anaconda navigator. this is the message i received:

Traceback (most recent call last):
File "C:\ProgramData\Anaconda2\lib\site-packages\tornado\web.py", line 1512, in _execute
result = yield result
File "C:\ProgramData\Anaconda2\lib\site-packages\tornado\gen.py", line 1055, in run
value = future.result()
File "C:\ProgramData\Anaconda2\lib\site-packages\tornado\concurrent.py", line 238, in result
raise_exc_info(self._exc_info)
File "C:\ProgramData\Anaconda2\lib\site-packages\tornado\gen.py", line 1063, in run
yielded = self.gen.throw(*exc_info)
File "C:\ProgramData\Anaconda2\lib\site-packages\notebook\services\sessions\handlers.py", line 73, in post
type=mtype))
File "C:\ProgramData\Anaconda2\lib\site-packages\tornado\gen.py", line 1055, in run
value = future.result()
File "C:\ProgramData\Anaconda2\lib\site-packages\tornado\concurrent.py", line 238, in result
raise_exc_info(self._exc_info)
File "C:\ProgramData\Anaconda2\lib\site-packages\tornado\gen.py", line 1063, in run
yielded = self.gen.throw(*exc_info)
File "C:\ProgramData\Anaconda2\lib\site-packages\notebook\services\sessions\sessionmanager.py", line 79, in create_session
kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)
File "C:\ProgramData\Anaconda2\lib\site-packages\tornado\gen.py", line 1055, in run
value = future.result()
File "C:\ProgramData\Anaconda2\lib\site-packages\tornado\concurrent.py", line 238, in result
raise_exc_info(self._exc_info)
File "C:\ProgramData\Anaconda2\lib\site-packages\tornado\gen.py", line 1063, in run
yielded = self.gen.throw(*exc_info)
File "C:\ProgramData\Anaconda2\lib\site-packages\notebook\services\sessions\sessionmanager.py", line 92, in start_kernel_for_session
self.kernel_manager.start_kernel(path=kernel_path, kernel_name=kernel_name)
File "C:\ProgramData\Anaconda2\lib\site-packages\tornado\gen.py", line 1055, in run
value = future.result()
File "C:\ProgramData\Anaconda2\lib\site-packages\tornado\concurrent.py", line 238, in result
raise_exc_info(self._exc_info)
File "C:\ProgramData\Anaconda2\lib\site-packages\tornado\gen.py", line 307, in wrapper
yielded = next(result)
File "C:\ProgramData\Anaconda2\lib\site-packages\notebook\services\kernels\kernelmanager.py", line 148, in start_kernel
super(MappingKernelManager, self).start_kernel(**kwargs)
File "C:\ProgramData\Anaconda2\lib\site-packages\jupyter_client\multikernelmanager.py", line 110, in start_kernel
km.start_kernel(**kwargs)
File "C:\ProgramData\Anaconda2\lib\site-packages\jupyter_client\manager.py", line 258, in start_kernel
**kw)
File "C:\ProgramData\Anaconda2\lib\site-packages\jupyter_client\manager.py", line 203, in _launch_kernel
return launch_kernel(kernel_cmd, **kw)
File "C:\ProgramData\Anaconda2\lib\site-packages\jupyter_client\launcher.py", line 128, in launch_kernel
proc = Popen(cmd, **kwargs)
File "C:\ProgramData\Anaconda2\lib\subprocess.py", line 390, in init
errread, errwrite)
File "C:\ProgramData\Anaconda2\lib\subprocess.py", line 640, in _execute_child
startupinfo)
WindowsError: [Error 267] The directory name is invalid

I tried to put "jupyter kernelspec list" on CMD but all I got is "'jupyter' is not recognized as an internal or external command, operable program or batch file"

[takluyver]

I tried to put "jupyter kernelspec list" on CMD but all I got is...

On Windows, you probably need to start an 'Anaconda prompt' from the start menu. This is still CMD, but it sets some things up so that you can access Python commands.

[Nemo900]

@takluyver Thanks for the reply. I tried to it in anaconda prompt and this is what I got:

How do I continue from here?

[takluyver]

The easiest thing is probably just to delete that directory - it should fall back on running the kernel on the same version of Python that runs your notebook server.

If you've got time to investigate, I'd be interested to see what directory it's pointing to that is invalid. Look for a kernel.json in that folder.

[Nemo900]

I found the kernel.json file. Should I delete it?

[takluyver]

I think deleting it will probably fix the issue, but if you'd like to post the contents of that file first, it might provide some hint of what went wrong. That could be useful if other people report the same error.

[Nemo900]

[takluyver]

Thanks. There's nothing obviously wrong there. I wonder if this is the wrong track. What's the directory where you're trying to create/open a notebook? It might be a python 2 Unicode issue.

…

On Tue, 3 Apr 2018, 10:42 p.m. Nemo900, ***@***.***> wrote: [image: image] <https://user-images.githubusercontent.com/38008847/38274854-ae5e2f3c-3798-11e8-8759-fb1aadc2ad4b.png> — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#3489 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAUA9ZPTApy63EMeQeZ_FU1-XCP0xSapks5tk97AgaJpZM4TDnjk> .

[Nemo900]

The problem was indeed a unicode issue, I had Hebrew in my directory so it didn't read it.

Thank you so much for all your help!

[takluyver]

No problem. If possible, I'd recommend using Python 3 - it's generally better at things like this.