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Python time series doesn't valdate?

Hi,

just started using Plotly and copied the code for the time series with range slider (https://plot.ly/python/time-series/#time-series-with-rangeslider) to a Jupyter notebook. The example does run and display a graph; however trying to save the notebook results in an error message:
Failed validating ‘oneOf’ in display_data[‘properties’][‘data’][‘patternProperties’][’^(?application/json$)[a-zzA-Z0-9}+/[a-zA-Z0-9\-\+\.]+$’]
Anybody know what the problem is?

Thanks, Ann.