error in python script

hi am having error in my script

python mapView.py
Traceback (most recent call last):
  File "mapView.py", line 44, in <module>
    style_function=lambda x: {'fillColor':'yellow'}))
  File "C:\ProgramData\Anaconda3\lib\site-packages\folium\features.py", line 450, in __init__
    self.data = self.process_data(data)
  File "C:\ProgramData\Anaconda3\lib\site-packages\folium\features.py", line 494, in process_data
    ': {!r}'.format(data))
ValueError: Cannot render objects with any missing geometries: <_io.TextIOWrapper name='world.json' mode='r' encoding='utf-8-sig'>

this my script
import folium

import pandas


data = pandas.read_csv("Volcanoes.txt")
lat = list(data["LAT"])
lon = list(data["LON"])
elev = list(data["ELEV"])




def color_producer(elevetion):
    if elevetion < 1000:
        return  'green'
    elif 1000 <= elevetion < 3000:
        return 'orange'
    else:
        return 'red'	


#map = folium.Map(location=[lat, lon], zoom_start=6, tiles="Stamen Terrain")
#map = folium.Map(location=[lat[0], lon[0]], zoom_start=5, tiles="Stamen Terrain")

map = folium.Map(location=[38.58,-99.09], zoom_start=5, tiles="Mapbox Bright")

#map = folium.Map(location=[0, 0], zoom_start=6)



fg = folium.FeatureGroup(name="My Map")

#for lt,ln,el in zip(lat,lon,elev):
 #    fg.add_child(folium.Marker(location=[lt, ln],popup=str(el)+" m",icon=folium.Icon(color=color_producer(el)))
	 
for lt,ln,el in zip(lat,lon,elev):
     fg.add_child(folium.CircleMarker(location=[lt, ln],popup=str(el)+" m",
	 fill_color=color_producer(el),color = 'grey',fill_opacity=0.7))
	 #icon=folium.Icon(color=color_producer(el))))	 

	 
	 
fg.add_child(folium.GeoJson(data=open('world.json','r',encoding='utf-8-sig'),
style_function=lambda x: {'fillColor':'yellow'}))
	 
map.add_child(fg)
map.save("map092.html")	

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Volcanoes.txt
world.json