Error: Not enough arguments?

[Kevin]

When you do gimp-image-merge-down it creates a new layer, so you need to find out what this is so it can be passed to plug-in-make-seamless.

For example I re-used theLayer as it doesn't exist after the merge down:

Code:

(set! theLayer (car (gimp-image-merge-down theImage theDesign 1)))
       (plug-in-make-seamless RUN-NONINTERACTIVE theImage theLayer)
       (gimp-displays-flush)

I also added the gimp-displays-flush so that it displayed the results so far.