[IPKernelApp] ERROR | No such comm target registered: jupyter.widget.control #3454
Comments
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same message |
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The message is harmless and can be ignored for now. If you don't see ipywidgets, it's unlikely to be the cause. |
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same error, and the ipython interpreter doesn't working after this message. |
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@jiangqucheng can you show your complete logs? I doubt this "error" is the cause of your issue, this is just a badly named warning. |
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I also think so, another server running on windows is fine, but this, run in docker, just can't work. |
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I can confirm in our case everything works as expected (we are running JLab in docker) thus we are ignoring the message. However, that kind of message gives me shivers - but as I understand we have what we have for now. |
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I can confirm this same behavior. It does happen only when activating a Notebook, but not when browsing the files or doing other activity. Versions: Python: Python 3.9.12OS & Arch: The result is I don't see any control when the widgets are missed: |
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Same here
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Again, this message is harmless and can be ignored for now. If you have ipywidgets not working, it's probably another issue so please open a separate issue. |
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This is a duplicate of an older issue: I'm just linking these two issues b/c I can see the error still exists. I searched for the error looking to see if there was an update, but I didn't see that other issue in the search results. That issue has a complete explanation as to what is going on and why this error and warning can be ignored. |
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Thanks for the reference. In particular, these two comments are where the explanation is: #2257 (comment) |
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@jasongrout thank you, we can all sleep better now ;) |
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From the link above:
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I did a fresh install a few days ago, but this problem still exists. There isn't a solution yet, but my recommendation is to wait patiently for a fix. It is a harmless error according to everything that has been posted in any of the issues or forum posts related to it. Here is the current state: |
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I had the same problem but restarting the systemd service resolved it for me. I am running jupyer lab via systemd and installed ipywidgets into the virtual environment. Kernel restarts didn't worked for me and also ipywidgets interactive was broken. A restart of the service solved it for me. Maybe it helps other people. |
Description
When new kernel session is instantiated(new notebook) JLab logs:
[IPKernelApp] ERROR | No such comm target registered: jupyter.widget.control[IPKernelApp] WARNING | No such comm: ded5178f-d06f-422a-851f-d7a4b564debbBelow is the context I just tried, but I tried with a lot of different versions combinations.
Reproduce
conda create -n ipywidgets_problem jupyterlab ipywidgets -yconda activate ipywidgets_problemjupyter labContext
Troubleshoot Output
Installed Labextensions
JupyterLab v3.4.0 /home/luka/miniconda3/envs/ipywidgets_problem/share/jupyter/labextensions jupyterlab_pygments v0.2.2 enabled OK (python, jupyterlab_pygments) @jupyter-widgets/jupyterlab-manager v3.1.0 enabled OK (python, jupyterlab_widgets)The text was updated successfully, but these errors were encountered: