Cannot locate shapefile

[Ryan Ollerenshaw]

I have had mapserver running successfully for several months now, but i 
had to reinstall both MapServer and Apache in order to add support for 
PostgreSQL.  As a result i had to change my file structure a bit and now 
i am getting the following errors:*

Warning*: [MapServer Error]: msSHPOpenFile(): 
(/var/www/htdocs/mapserver/./thm_img.shp) in 
*/var/www/htdocs/mapserver/simplemap.phtml* on line *27*

*Warning*: [MapServer Error]: msSHPOpenFile(): 
(/var/www/htdocs/mapserver/./../data/thm_img.shp) in 
*/var/www/htdocs/mapserver/simplemap.phtml* on line *27*

my mapfile is listed below but it was the same one that was working 
correctly for the last few months, does anyone know the direct cause of 
this error and why MapServer is looking in two different directories for 
my shapefile?  when i put the shapefile in both directories the error 
goes away but i get a blank map:

MAP
  IMAGETYPE PNG
  EXTENT -180 -90 180 90
  #EXTENT -350878.81 -9890271.86 350878.81 9890271.86
  SIZE 600 500
  SHAPEPATH "../data/"

  IMAGECOLOR 255 255 255

  WEB
    IMAGEPATH "/tmp/ms_tmp/"
    IMAGEURL "/ms_tmp/"
    METADATA
      wms_title "WMS test"
      wms_name "WMS test"
      wms_srs "EPSG:4326"
    END
  END

  PROJECTION
    "init=epsg:4326"
#    "proj=sinu"
    #"lon_0=0"
    #"ellps=WGS84"
    #"datum=WGS84"
  END
  LAYER
    NAME "themis"
    STATUS ON
    TILEINDEX "thm_img.shp"
   #TILEINDEX "thm_proj.shp"
    TILEITEM "location"

    PROJECTION
      "init=epsg:4326"
    END

    METADATA
     wms_title "Themis Dataset"
     wms_srs "EPSG:4326"
    END
    TYPE RASTER
  END