Px scatter_geo does not show map ERROR

I install ploty,express and geo offline, I tried to run the example codes bellow:
import plotly.express as px
df = px.data.gapminder().query(“year==2007”)
fig = px.scatter_geo(df, locations=“iso_alpha”, color=“continent”,
hover_name=“country”, size=“pop”,
projection=“natural earth”)

the VSCode does not show any errors and warnings
however,the Chrome browser does not show the map ,there is only the legend.
thanks for your help and happy chinese new year

another questions :“is there a method to run mapbox offline?” I want to show a map plot