[mapserver-users] GRASS GIS layers -help!

[Gazz1982]

I am using GRASS GIS with gdal and ogr support:

mapserv -v
MapServer version 5.4.2 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP
OUTPUT=SVG SUPPORTS=PROJ SUPPORTS=AGG SUPPORTS=FREETYPE SUPPORTS=ICONV
SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER
SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER SUPPORTS=FASTCGI SUPPORTS=THREADS
SUPPORTS=GEOS INPUT=EPPL7 INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE

Mapserver works with no problems with shapefiles

I tried to link to a GRASS layer using the following layer definition and it
returned this error:
msDrawMap(): Image handling error. Failed to draw layer named 'ex_area'.
msShapefileOpen(): Unable to access file.
(/var/www/grassdata/Keinsmerburg2/site_data/ex_area/1_polygon)
msShapefileOpen(): Unable to access file.
(/var/www/grassdata/Keinsmerburg2/site_data/ex_area/1_polygon) 

File permissions are set to www-data and are set to create and delete.

Any ideas? I would be very grateful
Gary

  LAYER
    NAME 'ex_area'
    TYPE POLYGON
    DUMP true
    TEMPLATE fooOnlyForWMSGetFeatureInfo
    EXTENT -30.311890 -1.325000 68.311890 54.325000
    DATA '/var/www/grassdata/Keinsmerburg2/site_data/ex_area/1_polygon'
    METADATA
      'ows_title' 'ex_area'
    END
    STATUS OFF
    TRANSPARENCY 100
    PROJECTION
    'proj=sterea'
    'lat_0=52.15616055555555'
    'lon_0=5.38763888888889'
    'k=0.9999079'
    'x_0=155000'
    'y_0=463000'
    'ellps=bessel'
    'units=m'
    'no_defs'
    END
    CLASS
       NAME 'ex_area' 
       STYLE
         SYMBOL 0 
         SIZE 7.0 
         OUTLINECOLOR 0 0 0
         COLOR 64 113 156
       END
    END
  END
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