How do we set layers for groups

[Sannyasin Brahmanathaswami via use-livecode]

if the layer of fld "checkHtml" > 3 then
      set the layer of fld "checkHtml" to 3
   else
      set the layer of fld "checkHtml" to 20                    
   end if

# do not work. 

stack "SlideShowSetUp": execution error at line 107 (Object: can't set layer 
(card not open, or control in group)), char 1

??

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