[Python] pydeck r.show() outputs TypeError: vars() argument must have __dict__ attribute

Until now, everything worked just fine. I've created a new file to create new heatmap. My dataframe is looks like this:

time name lng lat
2019-10-16 08:00:00 A 23.1113 34.123123
2019-10-16 09:00:00 B 12.1113 11.123123
2019-10-16 07:30:00 C 134.1113 12.123123
2019-10-16 08:40:00 D 122.1113 12.123123
2019-10-16 08:50:00 A 16.1113 12.123123


which is always exact same as dataframe I've used before when creating heatmap exact name, and other columns.

copy paste previous code for creating heatmap:

layer = pdk.Layer(
"HeatmapLayer",
df,
get_position="[lng, lat]"
)
center = [126.986, 37.565]
view_state = pdk.ViewState(
longitude=center[0],
latitude=center[1],
zoom=10
)
r = pdk.Deck(layers=[layer],
initial_view_state=view_state,
mapbox_key=MAPBOX_API_KEY)
r.show()


When I run w/o r.show() it doesn't show anything, when I run with r.show() it outputs TypeError: vars() argument must have __dict__ attribute

I cannot figure out what is wrong...

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