Can't use Jupyter Notebook: jsonschema apparently missing

I think I have a solution.

I did may things, regenerated my env (anaconda env) from another computer where it worked, but no success.

What I think that nailed it is upgrading jsonschema to 2.5.1

Here are my steps from "bad" jupyter env to working jupyter env.

Good luck and come back if it doesn't work, I will post the notebook* relevant versions.

>conda upgrade pip
pip:        8.1.0-py27_0  --> 8.1.1-py27_0
setuptools: 20.2.2-py27_0 --> 20.3-py27_0 

>pip install functools32
Downloading functools32-3.2.3-2.tar.gz    
Successfully installed functools32-3.2.3.post2

>jupyter notebook
ImportError: No module named _version
Jupyter notebook format depends on the jsonschema package:
    https://pypi.python.org/pypi/jsonschema
Please install it first.

>pip install jsonschema
Requirement already satisfied

>pip install --upgrade jsonschema
Collecting jsonschema
Downloading jsonschema-2.5.1-py2.py3-none-any.whl
Successfully uninstalled jsonschema-2.4.0
Successfully installed jsonschema-2.5.1

>jupyter notebook
[I 16:45:41.708 NotebookApp] Writing notebook server cookie secret to 
[I 16:45:42.134 NotebookApp] Serving notebooks from local directory: 
[I 16:45:42.134 NotebookApp] 0 active kernels 
[I 16:45:42.134 NotebookApp] The Jupyter Notebook is running at: http://localhost:8888/

i also got the same error and none of the above mentioned procedures worked for me so i've checked the documentation of anaconda and found something useful

conda install -c conda-forge/label/cf201901 jsonschema

conda install jupyter

jupyter notebook

this worked for me,thanks to anaconda documentation

Re-install jsonschema solve the problem in my case:

$ pip uninstall jsonschema
...

$ pip install jsonschema
...