Problem in Geodjango

Hi Everyone ..

I am following the steps given in 

https://docs.djangoproject.com/en/dev/ref/contrib/gis/tutorial/#

and the steps i followed before https://docs.djangoproject.com/en/dev/ref/contrib/gis/tutorial/#spatial-queries were working fine but after that I got error in the * qs = WorldBorder.objects.filter(mpoly__contains=pnt_wkt) in this Statement .

 Error it is showing is 

 FieldError: Cannot resolve keyword 'mpoly' into field. Choices are: area, fips, geom, id, iso2, iso3, lat, lon, name, pop2005, region, subregion, un

and if I am executing this line 

 sm = WorldBorder.objects.get(name='San Marino') 

Error is  

DatabaseError: column world_worldborder.geom does not exist LINE 1: ...ld_worldborder"."lon", "world_worldborder"."lat", "world_wor...*

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