group command not working?

[MisterX]

The group command below doesn't work.

I also tried with select (do "select" && nulist)

and neither works... Any ideas?

here's the error

Type	Group: bad object type
Line	(why can't it figure the line out?)
Hint	group  Image 1 and Image 2 and Image 3 and Image 4 and Image 5 and
Image 6 and Image 7 and Image 8 and Image 9 and Image 10 and Image 11 and
Image 12 and Image 13 and Image 14 and Image 15 and Image 16 and Image 17
and Image 18 and Image 19 and Image 20 and Image 21 and Image 22 and Image
23 and Image 24 and Image 25 and Image 26 and Image 27 and Image 28 and
Image 29 and Image 30 and Image 31 and Image 32 and Image 33 and Image 34
and Image 35 and Image 36 and Image 37 and Image 38

Here's the script. 
if you right click on the group command, the help will take you to the wrong
(subjective) page and insert the wrong filter keyword (not really
subjective)...

But once you see the revdoc group command definition, there's no reason this
script shouldn't work.

Any ideas?
Thanks
Xavier

Script below...

on mouseUp
  --choose pointer tool
  put the number of images into ic
  put 100 into ytop
  put 10 into lastx
  repeat with x = 1 to ic
    show img x
    if lastx + 16 > the width of this card then 
      put 10 into lastx
      add 24 to ytop
    end if
    
    set the topleft of img x to lastx, ytop
    get the width of img x
    if it < 20
    then add 24 to lastx
    else add it+4 to lastx
    if x < ic then  put " Image" && x && "and" after nulist
    else put " Image" && x after nulist
  end repeat
   -- none of these work?!!
   group nulist
   do "group" && nulist
   -- Attempt #2
   lock messages -- or the selection is extremely slow thanks to RPP
   select nulist or do "select && nulist
   domenu "Selected group" -- wont work
   group the selobj -- wont work
end mouseUp

after script is done and tried to group the selected images also failed...