plotly.graph_objs - Scatter mode error

[Larz60+]

The version of plotly that you're using requires ipwidgets 7.5 (which you haveinstalled) and jupyterlab 1.2

JupyterLab Support (Python 3.5+)

For use in JupyterLab, install the jupyterlab and ipywidgets packages using pip...

pip install jupyterlab==1.2 "ipywidgets==7.5"

you're running jupyterlab 2.0.1. I can't say if that's a problem, but needs looking into.
perhaph there's mor on the github repository here: https://plot.ly/python/

also was built for python 3.7.1, but is probably ok if your version is newer.
you can tell from commandline (arg is capital V):
python -V