LISP to filter by linetype not working

Can someone look over the LISP below and tell me if you can why it's not picking anything up? There are objects in my drawing with the linetype that I'm trying to pick, but it's getting to the end of the LISP and saying 'nothing found'. Can anyone see what's wrong please?

(defun c:fhl(/ cSet)

 (setq cSet(ssget
              '((6 . "#RVeg"))
            ); end ssget
); end setq
 
 (if cSet
   (progn
     (princ(strcat "\n" (itoa(sslength cSet)) " found."))
     (sssetfirst nil cSet)
     ); end progn
    (princ "\nNothing found. ")
   ); end if
 (princ)
 ); end of c:fhl

This routine would not select objects that either;

-user doesn't select

-have a linetype that is "bylayer"

This routine would not select objects that either;

 

-user doesn't select

-have a linetype that is "bylayer"

The objects I was trying to select had a linetype set to #RVeg (not bylayer). I also typed 'ALL' for my selection in the drawing, so I can't understand why it wouldn't pick them up.