error 500 while enabling REQUIRES

[Sergio Lopez]

Hi there:
I have a problem, when I turn on REQUIRES in a layer I receive a Internal
Server error 500. everithing works fine when I comment the line.
the line in my .map file is:

REQUIRES "![Img]"

I also tried
REQUIRES "[Img] !=1"

the "Img" layer is a TIFF raster.
The issue is that the map file worked perfectly well with version 4.2 of
mapscript.dll. The problem appeared when I upgraded to 4.4 and above.

am I doing something wrong?

both llayers are:
LAYER
    NAME "Img"
    STATUS OFF
    DATA "mdpgk2.TIF"
    TYPE RASTER
    UNITS METERS
    SIZEUNITS PIXELS
  END
LAYER
    NAME "Manzanas"
    GROUP "Base"
    STATUS ON
    CONNECTIONTYPE POSTGIS
    CONNECTION "host=xxport=5432 dbname=xxuser=xxpassword=xx"


    DATA "the_geom from manzanas"
    TYPE POLYGON
    CLASSITEM "verde"
    UNITS METERS
    SIZEUNITS PIXELS
    MAXSCALE 25000
    REQUIRES "![Img]"
    TOLERANCE 10
    TOLERANCEUNITS PIXELS
    CLASS
      NAME "comunes"
      EXPRESSION "0"
      STYLE
        SYMBOL 0
        COLOR 255 255 199
        OUTLINECOLOR 100 100 100
        SIZE 3
      END
    END
    CLASS
      NAME "VERDES"
      EXPRESSION "1"
      STYLE
        SYMBOL 0
        COLOR 0 170 0
        OUTLINECOLOR 100 100 100
        SIZE 3
      END
    END
    CLASS
      NAME "AGUA"
      EXPRESSION "3"
      STYLE
        SYMBOL 0
        COLOR 0 0 240
        OUTLINECOLOR 100 100 100
        SIZE 3
      END
    END
  END

Thanks in advance

Sergio
La Plata - Argentina