I'm following the GeoDjango 
tutorial<https://docs.djangoproject.com/en/dev/ref/contrib/gis/tutorial/>, 
and when I get to the "Run syncdb" section and I run "python manage.py 
syncdb", I get the following error:

Failed to install index for world.WorldBorder model: function 
> addgeometrycolumn(unknown, unknown, integer, unknown, integer) is not unique
> LINE 1: SELECT AddGeometryColumn('world_worldborder', 'mpoly', 4326,...
>                ^
> HINT:  Could not choose a best candidate function. You might need to add 
> explicit type casts.


Sure enough there are about 5 AddGeometryColumn functions in my database 
created from a PostGIS database template. I understand that it's using 
overloads, but why isn't this working?


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