Extension does not load: undefined is not an object (evaluating 'action.help')

[ischurov]

First of all, thanks for this extension, I found it very useful in my work!

I upgraded python → 3.8 and jupyter and currently cannot load jupyter-black extension if toolbar button is enabled. In javascript console I have the following error message:

[jupyter-black] – "error loading:"
TypeError: undefined is not an object (evaluating 'action.help') — toolbar.js:98
on_error — kernel_exec_on_cell.js:352
promiseReactionJob
toolbar.js:98

The corresponding source code:

                var button  = $('<button/>')
                    .addClass('btn btn-default')
                    .attr("aria-label", el.label)
                    .attr("title", i18n.msg._(action.help)||el.label)
                    .append(
                        $("<i/>").addClass(el.icon||(action||{icon:'fa-exclamation-triangle'}).icon).addClass('fa')
                    );

If I disable toolbar button, extension is loaded and working with hotkey.

[a0th]

Im having the same issue, although my message seem different. Like @ischurov mentioned, the shortcut will work if you disable the toolbar addition

Exception in event handler for kernel_ready.Kernel TypeError: Cannot read property 'help' of undefined
    at main.min.js?v=142ed316196fd3eff14daef5cac87ab9:44729
    at Array.forEach (<anonymous>)
    at MainToolBar.ToolBar.add_buttons_group (main.min.js?v=142ed316196fd3eff14daef5cac87ab9:44716)
    at KernelExecOnCells.add_toolbar_button (kernel_exec_on_cell.js?v=20200803182054:192)
    at KernelExecOnCells.setup_for_new_kernel (kernel_exec_on_cell.js?v=20200803182054:284)
    at window._Events.<anonymous> (kernel_exec_on_cell.js?v=20200803182054:349)
    at window._Events.dispatch (main.min.js?v=142ed316196fd3eff14daef5cac87ab9:2)
    at window._Events.v.handle (main.min.js?v=142ed316196fd3eff14daef5cac87ab9:2)
    at Object.trigger (main.min.js?v=142ed316196fd3eff14daef5cac87ab9:2)
    at window._Events.<anonymous> (main.min.js?v=142ed316196fd3eff14daef5cac87ab9:2)

[rgbkrk]

This issue is happening with a newer release of the jupyter notebook. The upstream fix is here: jupyter/notebook#5676

[rgbkrk]

Please upgrade to notebook 6.1.4 and let me know if it fixes the issue.

[HaHeho]

Installing notebook'>=6.1.4' from conda-forge fixed the problem for me.

[ischurov]

I confirm, it works now. Thanks a lot! Closing this.