[GRASSLIST:6270] v.in.ogr error

[Kirk R. Wythers]

What is implied by the error:

GRASS 6.0.0 (arrowhead_utm):~ > v.in.ogr -o 
dsn=/Users/kirkw/projects/wrf/grids/ layer=forties output=forties
Over-riding projection check.
Proceeding with import...
Layer: forties
DBMI-DBF driver error:
Column 'PLS_FORTYP' already exists (duplicate name)
Cannot create table.
Error in db_execute_immediate()

ERROR: Cannot create table: create table forties_grid (cat integer, AREA
        double precision, PERIMETER double precision, PLS_FORTYP integer,
        PLS_FORTYP integer, COUN integer, TOWN integer, RDIR integer, 
RANG
        integer, SECT integer, FORT integer, GLOT integer, PARC integer,
        FORT_DESC varchar ( 40 ), GLOTMATCH integer, GEOPARC integer,
        GEOGLOT integer, GEOFORT integer, GEOSECT integer, GEORANG 
integer,
        HECTARES double precision)

I am trying to import some shape files into utm location in grass6.0. 
The shape files have the naming scheme:
forties.dbf
forties.sbn
forties.sbx
forties.shp
forties.shx

Thanks,

Kirk