ValueError: Invalid property specified for object of type plotly.graph_objs.layout.Legend: 'fontsize' Did you mean "font"?

This error message suggests that you have specified an invalid property name for the `Legend` object in your Plotly graph. Specifically, it seems that you have used the property name `fontsize`, which is not a valid property for the `Legend` object. The error message is suggesting that you may have meant to use the property name `font` instead.

To fix this error, you should replace the property name `fontsize` with the correct property name `font` in your code. For example, if you were trying to set the font size of the legend, you could use the following syntax:

fig.update_layout(
    legend=dict(
        font=dict(
            size=16
        )
    )
)

This sets the font size of the legend to 16 points.