Bug + Documentation:: troubleshooting suspect packages and lining up error in web console

[bugsbunny88]

If I get errors in web browser console after adding packages from one of the demo templates, I suspect its the new additions that have caused it. For documentation how does one figure out which package is the culprit ?

ERROR: received bad message: No such comm registered: 261e3190-6ddb-4ce8-99fd-ebc03f71c0dd

or ie.

Message type: comm_msg [xpython.js:8:68812](https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js)
    put_char https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js:8
    write https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js:8
    write https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js:8
    doWritev https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js:8
    _fd_write https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js:8
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:6638269
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:6727614
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:6727785
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:7105001
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:7036102
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:7060179
    invoke_iii https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js:8
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:7060305
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:3353705
    invoke_ii https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js:8
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:6570437
    invoke_viii https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js:8
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:6560828
    invoke_vii https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js:8
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:6576160
    invoke_vii https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js:8
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:6609011
    invoke_vii https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js:8
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:3348993
    invoke_vii https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js:8
    <anonymous> https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.wasm:3290525
    xserver_emscripten$notify_listener https://bugsbunny88.github.io/xeus-me/xeus/bin/xpython.js line 8 > Function:10
    processMessage https://bugsbunny88.github.io/xeus-me/extensions/@jupyterlite/xeus/static/213.d616ac417a8e48894385.js?v=d616ac417a8e48894385:1
    s https://bugsbunny88.github.io/xeus-me/extensions/@jupyterlite/xeus/static/213.d616ac417a8e48894385.js?v=d616ac417a8e48894385:1

And from a solutions perspective , what does one have to do to rectify or act on the warnings like :

Default kernel not found, using 'xpython'

does that mean its a configuration issue when doing jupyter lite build , or its just a minor quibble that should just be ignored ?

[Carreau]

I believe this can be ignored. If you do experience actual issues when using Jupyter-lite, this might be related but I doubt this will have an impact.

This can happen if you for example have a widget displayed but the kernel have been restarted (or vice versa, the kernel has a widget handle but the widget on the frontend has ben deleted).

You end up with a message with a non-existing ID.

A few other things use comms, so maybe something else is not working, but I'm not sure how to track that down in wasm.

I wouldn't worry for now, and report back if/when you find something not actually working.

[bugsbunny88]

Thank you for that advice , my initial belief was to ensure there were no errors in the browser console. I will focus on usability within the notebooks themselves as the main marker. Thanks