GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: New User

List any ERROR messages you received:
fp-script-fu-anim-path-stroke: image-type contains unrecognizable parts:'RGB* GRAYSCALE*'

(script-fu.exe:108612): LibGimpBase-WARNING **: script-fu.exe: gimp_wire_read(): error

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using gimp2.8.18 running from an msys shell shows the errormessage above.

Greets
Peter

It is just a warning and the script still works for RGB and Greyscale images.

@PKHG, I think you need to edit the fp-script-fu-path-suite.scm file to replace GRAYSCALE* with GRAY*

Kevin

Thanks, will try (and inform you later) Kevin