Troubleshooting 'No Such Comm Target Registered: Jupyter.Widget.Control' Error: A Step-by-Step Guide

This guide will walk you through the process of troubleshooting the 'No Such Comm Target Registered: Jupyter.Widget.Control' error that you might encounter when working with Jupyter widgets. We will provide a step-by-step solution to this issue, as well as a helpful FAQ section for quick reference.

Table of Contents

  1. Introduction
  2. Step-by-Step Troubleshooting Guide
  3. FAQ
  4. Related Links


Jupyter widgets are interactive, event-driven elements that can be used to create dynamic visualizations, user interfaces, and more in a Jupyter notebook. However, sometimes you may encounter the 'No Such Comm Target Registered: Jupyter.Widget.Control' error. This error usually occurs when the required widget libraries are not properly installed or there is a version conflict between the installed libraries.

Step-by-Step Troubleshooting Guide

To resolve the 'No Such Comm Target Registered: Jupyter.Widget.Control' error, follow these steps:

Step 1: Check Installed Jupyter Widget Libraries

The first step is to verify that you have the required widget libraries installed. You can do this by running the following command in your terminal or command prompt:

pip list | grep 'ipywidgets\|widgetsnbextension'

If ipywidgets and widgetsnbextension are not listed in the output or the versions do not match the requirements, proceed to Step 2.

Step 2: Install or Update Jupyter Widget Libraries

To install or update the required widget libraries, run the following commands in your terminal or command prompt:

pip install --upgrade ipywidgets
pip install --upgrade widgetsnbextension

Step 3: Enable Widgetsnbextension

After installing or updating the widget libraries, you need to enable widgetsnbextension. Run the following command in your terminal or command prompt:

jupyter nbextension enable --py widgetsnbextension

Step 4: Restart Jupyter Notebook Server

Finally, restart your Jupyter notebook server to apply the changes. If you were running Jupyter notebook using the command jupyter-notebook, you can stop it by pressing Ctrl + C in the terminal or command prompt and then start it again using the same command.

Now, the 'No Such Comm Target Registered: Jupyter.Widget.Control' error should be resolved, and you can use Jupyter widgets without any issues.


1. Can I use Jupyter widgets in JupyterLab?

Yes, Jupyter widgets can be used in JupyterLab. However, you need to install the @jupyter-widgets/jupyterlab-manager extension for JupyterLab. To install it, run the following command:

jupyter labextension install @jupyter-widgets/jupyterlab-manager

2. What is the difference between ipywidgets and widgetsnbextension?

ipywidgets is a package that provides interactive widgets for the Jupyter notebook. On the other hand, widgetsnbextension is a package that enables the use of those widgets in the classic Jupyter Notebook interface.

3. Do I need to install any additional packages for specific widgets?

Some widgets, like bqplot, ipyleaflet, and ipyvolume, require additional packages to be installed. You can find the installation instructions for these packages in their respective documentation.

4. How can I check if a specific widget is working correctly?

You can test a specific widget by importing it and creating an instance of the widget in a Jupyter notebook cell. For example, to test the IntSlider widget from ipywidgets, you can run the following code in a notebook cell:

from ipywidgets import IntSlider


5. What should I do if the error persists after following the troubleshooting guide?

If the error still occurs after following the steps in this guide, you might want to consider posting a question on Stack Overflow or GitHub with the relevant details, including the error message, version information, and any troubleshooting steps you have already tried.

Great! You’ve successfully signed up.

Welcome back! You've successfully signed in.

You've successfully subscribed to

Success! Check your email for magic link to sign-in.

Success! Your billing info has been updated.

Your billing was not updated.