Batch script will not run - I'm out of ideas

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as totally new both on script-fu and in this group I'll try not to stress your 
I made a script to downscale all images in a directory:
(define (autoskaler pattern width height)
  (let* ((filelist (cadr (file-glob pattern 1))))
    (while filelist
           (let* ((filename (car filelist))
                  (image (car (gimp-file-load RUN-NONINTERACTIVE
                                              filename filename)))
                   (drawable (car (gimp-image-get-active-layer image))))
                                   image drawable 0.0 0.0 width height 1 1 )
             (gimp-image-resize  image width height 0 0)
             (gimp-file-save RUN-NONINTERACTIVE
                             image drawable filename filename)
             (gimp-image-delete image))
           (set! filelist (cdr filelist)))))
Saved it as  autoskaler.scm in ~/.gimp-2.2/scripts and tries to run it batch 
with: gimp -i  -b '(autoskaler "*.JPG" 1600.0 1200.0 )' '(gimp-quit 0)'
Then it presents me with: batch command: experienced an execution error. Hmm, 
tries the interactive script-fu console using (autoskaler "*.JPG" 1600.0 
1200.0 ) and it then says: 
ERROR: Procedural database execution failed:
    (gimp_drawable_transform_scale_default 1 2 0 0 1600 1200 1)
And now I can't figure out whats wrong since I have a reference to both an 
image and a layer. Most of the code I just copied from the batch section of 
the docs on
I really like the way gimp scales images, so it would be great to have this 
script work.
Best regards

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