GIMP :: Curves Spline Batch On Set Of Images (2011)

I am attempting to set up a batch that automatically runs gimp-curves-spline on a set of images. However, I have never used Scheme before and therefore am not sure why my script is returning "batch command experienced an execution error"

Here is the command I am using to call the script(via a windows .bat file)

gimp-2.6.exe -i --verbose -b "(color-curve "C:\gimpbatchtest\*.tiff")" -b "(gimp-quit 0)"

And the script itself:

(define (color-curve pattern) (let* ((filelist (cadr (file-glob pattern 1))))
(while (not (null? filelist)) (let* ((filename (car filelist))
(image (car (gimp-file-load RUN-NONINTERACTIVE filename filename)))
(drawable (car (gimp-image-get-active-layer image))))
(gimp-curves-spline RUN-NONINTERACTIVE image HISTOGRAM-VALUE 3 '(0 0 64 200 128 46))
(gimp-file-save RUN-NONINTERACTIVE image drawable filename filename)
(gimp-image-delete image)) (set! filelist (cdr filelist)))))