world_worldborder.geom does not exist

Following https://docs.djangoproject.com/en/dev/ref/contrib/gis/ , I've created the application world.

But the admin page wold not show me the actual map, instead i get the attached result.

Attempt to admin/world/worldborder/ end with following error:

>>>

ProgrammingError at /admin/world/worldborder/

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

Request Method:	GET
Request URL:	http://37.139.10.184:8000/admin/world/worldborder/
Django Version:	1.6
Exception Type:	ProgrammingError
Exception Value:	column world_worldborder.geom does not exist LINE 1: ...ld_worldborder"."lon", "world_worldborder"."lat", "world_wor... ^

Can please someone advice, as the original documentation is hard to understand and unhelpful?

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