kernel_spec_manager_class not recognized Issue

[Cl1p]

WSL Ubuntu UWP

VERSION="18.04.5 LTS (Bionic Beaver)"

I not sure if this is an issue, but this warning happens all the time when I trying to trust some ipython notebook

Pls have a look , thanks😊

[kevin-bates]

Hi @Cl1p - this warning message is harmless as jupyter trust does not use the kernel_spec_manager_class traitlet.

What's interesting is that I can only reproduce this by setting c.TrustNotebookApp.kernel_spec_manager_class in my notebook configuration file. Initially, I thought that perhaps setting c.NotebookApp.kernel_spec_manager_class would lead to this if the trust application derives from NotebookApp (where kernel_spec_manager_class is supported), but it derives from JupyterApp - and essentially always has.

Since NotebookApp.kernel_spec_manager_class is rarely set to anything other than its default ('jupyter_client.kernelspec.KernelSpecManager'), I'm wondering if you happen to use nb_conda_kernels which does set that traitlet to a non-defaulted value. But, even then, and per the previous paragraph, you'd still need an explicit entry in your configuration file relative to c.TrustNotebookApp.kernel_spec_manager_class to cause the warning message.

To see which configuration file is in play when running jupyter trust, add the --debug option, after which you'll see the candidate configuration files along with the file it selected based on the path hierarchy. Once the file is located, see if you have an uncommented entry like c.TrustNotebookApp.kernel_spec_manager_class=<some.python.class.path> and remove or comment out that entry (the latter to be safe).

Since this is not an issue for this repository, I'm going to close it. However, should you find anything relative to your configuration settings, it would be great to hear back. Thanks.