Jupyter notebook: TypeError: __init__() got an unexpected keyword argument 'io_loop'

Question

I recently installed jupyter notebooks on my macbook pro. When I create a new notebook, I see the following exception coming continuously on the terminal where I started the

Answer 1

Downgrade tornado, this worked for me.

pip install tornado==4.5.3

based on: https://github.com/liftoff/GateOne/issues/689

Answer 2

It is a version incompatibility issue. Upgrading Jupyter solves it. Here is what you should try in macOS:

pip install --upgrade jupyter

Answer 3

Ran into this error after updating the ipykernel module.

After upgrading the jupyter module it started without errors. On Ubuntu I ran the following to update jupyter:

sudo -H pip install jupyter

Or for Python3

sudo -H pip3 install jupyter

Answer 4

I modified the file "/Library/Python/2.7/site-packages/notebook-5.2.2-py2.7.egg/‌​notebook/base/zmqhan‌​dlers.py" to remove the io_loop argument.

Based on bkanuka's comment, this is the way to go until Jupyter releases a new version.