Code works a cds6 but not on cds5

 Hi, I have a procedure witch creates a pcell.  This is working in cds 6, but when I try to use it in cds5 it goes wrong.

 First piece of code is :

procedure( icsMatchedArrayUnit(libName cellName mosType l w pcDrainN)

 pcDefinePCell(

    ; Declare cell identifier
    list(ddGetObj(libName) cellName "layout")

    ; Set pcell parameters
    (
    (Unit int 1)
    (l float l)
    (w float w)
    (pcLibName string car(mosType))
    (pcViewName string cadr(mosType))
    (pcViewType string caddr(mosType))
    (pcDrainN int pcDrainN)
    )

It goes wrong after the second line, error I get is *WARNING* Invalid cell name - nil

Does somebody know what's wrong here?

Thanks
Rik