I need help setting up my map file to use tiled data from an NFS source.  My shapefiles are stored on NT in an NFS shared folder.  The folder is mapped as "/gdata" on my linux box.  The folder contains two subfolders; "County_Data" and "Statewide_Data."  I can map individual shapefiles in my .map file fine.  There is a shapefile containing the outlines of the counties at "/gdata/Statewide_Data/counties.shp" which has a field called LOCATION.  The "/gdata/County_Data" folder contains a folder for each county.  Each county's folder contains shapefiles for several data layers.  My .map file contains the following, but I get "loadLayer(): Unknown identifier. (INDEX):(99)" when I try to use it.  Any help would be appreciated.

#
# Start of map file
#
NAME DEMO
STATUS ON
SIZE 350 500
SHADESET symbols/shade.sym
MARKERSET symbols/marker.sym
LINESET symbols/line.sym
EXTENT -93.00 29.00 -86.00 36.00
#EXTENT 254189.000000 1117801.000000 292781.000000 1151833.000000
UNITS DD 
TILE "/gdata/Statewide_Data/"
SHAPEPATH "/gdata/Statewide_Data"
IMAGECOLOR 255 255 255

