Jupityr notebook kernel error - FileNotFoundError: [WinError 2]

Question

i recently ran into some problems with some of the libraries on Anaconda so i reinstalled Anaconda and when i started it up again, The Jupityr Notebook kernel error spots this text:

Traceback (most recent call last):
  File "C:\Users\Steven\Anaconda3\lib\site-packages\tornado\web.py", line 1543, in _execute
    result = yield result
  File "C:\Users\Steven\Anaconda3\lib\site-packages\tornado\gen.py", line 1099, in run
    value = future.result()
  File "C:\Users\Steven\Anaconda3\lib\site-packages\tornado\gen.py", line 1107, in run
    yielded = self.gen.throw(*exc_info)
  File "C:\Users\Steven\Anaconda3\lib\site-packages\notebook\services\sessions\handlers.py", line 73, in post
    type=mtype))
  File "C:\Users\Steven\Anaconda3\lib\site-packages\tornado\gen.py", line 1099, in run
    value = future.result()
  File "C:\Users\Steven\Anaconda3\lib\site-packages\tornado\gen.py", line 1107, in run
    yielded = self.gen.throw(*exc_info)
  File "C:\Users\Steven\Anaconda3\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:\Users\Steven\Anaconda3\lib\site-packages\tornado\gen.py", line 1099, in run
    value = future.result()
  File "C:\Users\Steven\Anaconda3\lib\site-packages\tornado\gen.py", line 1107, in run
    yielded = self.gen.throw(*exc_info)
  File "C:\Users\Steven\Anaconda3\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:\Users\Steven\Anaconda3\lib\site-packages\tornado\gen.py", line 1099, in run
    value = future.result()
  File "C:\Users\Steven\Anaconda3\lib\site-packages\tornado\gen.py", line 315, in wrapper
    yielded = next(result)
  File "C:\Users\Steven\Anaconda3\lib\site-packages\notebook\services\kernels\kernelmanager.py", line 148, in start_kernel
    super(MappingKernelManager, self).start_kernel(**kwargs)
  File "C:\Users\Steven\Anaconda3\lib\site-packages\jupyter_client\multikernelmanager.py", line 110, in start_kernel
    km.start_kernel(**kwargs)
  File "C:\Users\Steven\Anaconda3\lib\site-packages\jupyter_client\manager.py", line 259, in start_kernel
    **kw)
  File "C:\Users\Steven\Anaconda3\lib\site-packages\jupyter_client\manager.py", line 204, in _launch_kernel
    return launch_kernel(kernel_cmd, **kw)
  File "C:\Users\Steven\Anaconda3\lib\site-packages\jupyter_client\launcher.py", line 128, in launch_kernel
    proc = Popen(cmd, **kwargs)
  File "C:\Users\Steven\Anaconda3\lib\subprocess.py", line 709, in __init__
    restore_signals, start_new_session)
  File "C:\Users\Steven\Anaconda3\lib\subprocess.py", line 997, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] The system cannot find the file specified

I get this error when i start up and open a file. It refuses to run the code, just sitting there kinda dead. The kernel error appears in nearly all of the files opened with the Jupyter notebook.

Solved this my self, appears that for some reason the kernel did not install properly. Fixed with: python -m ipykernel install --user — Steven AA, Jul 06 '18 at 07:05

score 4 · Answer 1 · answered May 02 '19 at 17:36

4

The solution below worked for me. You can either run this code in command prompt in your virtual environment OR in the Anaconda prompt.

python -m ipykernel install --user

For detailed explanation and instructions have a look here.

answered May 02 '19 at 17:36

K.T.

51
5

score 2 · Answer 2 · answered Aug 13 '19 at 03:28

2

Open Anaconda Prompt
Activate your env
type: python -m ipykernel install --user
Start your jupyter notebook

answered Aug 13 '19 at 03:28

saurabh kumar

506
4
13

score 1 · Answer 3 · edited Jun 22 '21 at 03:43

1

This solution may be helpful for Windows users.

pip uninstall jupyter
Go to ~\AppData\Roaming (AppData is a hidden file) and delete the folder named jupyter and python(if there exists.)
Delete ~\.jupyter, ~\.ipython.
pip install jupyter

I was using Jupiter without anaconda and this perfectly fixed the issue. Not sure if this works for Jupiter with anaconda.

I used this trick it worked for me, I also use Jupiter without Anaconda.

edited Jun 22 '21 at 03:43

vitaliis

4,082
5
18
40

answered Oct 20 '19 at 18:40

segas

11
2

i wasted days and days in order to solve this and this solution works for me.. I will try with Anaconda as well and let you know.. – Nitin Tripathi Oct 29 '20 at 20:14
What will the user lose when deleting those directories? What data is stored in them? – bugmenot123 Feb 08 '21 at 14:02

score 0 · Answer 4 · answered Mar 01 '21 at 03:45

0

I had the same problem, this quick fix solved my problem

pip3 install --upgrade --force-reinstall --no-cache-dir jupyter

Reference: Cannot uninstall requirement jupyter, not installed

answered Mar 01 '21 at 03:45

Miguel Gutierrez

159
2
8

score 0 · Answer 5 · answered Apr 30 '21 at 06:31

Encountered the same thing, but the answer was surprisingly simple for me: I used VSCode to execute some of the code generating graphs, and the graphs came out too big in Jupyter Notebook, although I specified figsize (16,9).

Re-ran these in jupyter notebook, and it went just fine.

score 0 · Answer 6 · answered May 11 '23 at 12:59

0

I had the same issue. What worked for me was python -m ipykernel install --user --name (insert your env name her) . I can now open Jupyter notebook in my virtual environment.

answered May 11 '23 at 12:59

Ivy Kutswa

1

1

Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Blue Robin May 11 '23 at 19:36

Jupityr notebook kernel error - FileNotFoundError: [WinError 2]

6 Answers6