Model `Slider' does not exist. This could be due to a widget or a custom model not being regi

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<https://stackoverflow.com/questions/48645763/bokeh-model-slider-does-not-exist-this-could-be-due-to-a-widget-or-a-custom#>

I am trying to execute the Gapminder example app using Bokeh:

https://github.com/georgetown-analytics/XBUS-506-01.Visual_Analytics/blob/master/bokeh/gapminder.ipyn
<https://github.com/georgetown-analytics/XBUS-506-01.Visual_Analytics/blob/master/bokeh/gapminder.ipynb>
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# Add the slider
    code = """
        var year = slider.get('value'),
            sources = %s,
            new_source_data = sources[year].get('data');
        renderer_source.set('data', new_source_data);
        text_source.set('data', {'year': [String(year)]});
    """ % js_source_array

callback = CustomJS(args=sources, code=code)
slider = Slider(start=years[0], end=years[-1], value=1, step=1, title="Year", callback=callback)
callback.args["renderer_source"] = renderer_source
callback.args["slider"] = slider
callback.args["text_source"] = text_source

And I get an error while executing the code to show output as HTML file:

output_file("six.html")
show(plot)

Bokeh: Model `Slider' does not exist. This could be due to a widget or a
custom model not being registered before first usage
<https://stackoverflow.com/questions/48645763/bokeh-model-slider-does-not-exist-this-could-be-due-to-a-widget-or-a-custom>

<https://lh3.googleusercontent.com/-8nHCf5xvjzs/WnnOBg1NEUI/AAAAAAAAAAM/ONx3mtHSec0H4jVmIEVI-Ren4izGBUWYQCLcBGAs/s1600/slidernotexist.PNG>

Even for 'Select' widget, it shows the same error.

<https://lh3.googleusercontent.com/-USR_oHMqDGQ/WnnOfkrlh7I/AAAAAAAAAAQ/Pqc9815BDlMlXVXPBwtHshH8Z73AO17MACLcBGAs/s1600/selectdonotexist.PNG>