Error in scalefactors

Hi,

I'm new to maxima (using maxima 5.9.0, gcl-2.5.0) and have following problem with scalefactors in polar coordinates:

(C1) load(vect);

(D1)          /usr/local/share/maxima/5.9.0/share/vector/vect.mac
(C2) load(vect_transform);

(D2)     /usr/local/share/maxima/5.9.0/share/vector/vect_transform.mac
(C3) aa:laplacian f;

(D3)                              LAPLACIAN F
(C4) scalefactors(cartesian3d);

(D4)                                 DONE
(C5) express(aa);

                                 2     2     2
                                d F   d F   d F
(D5)                            --- + --- + ---
                                  2     2     2
                                dZ    dY    dX
(C6) scalefactors(polar);

Error: MACSYMA-TOP-LEVEL [or a callee] requires more than one argument.
Fast links are on: do (si::use-fast-links nil) for debugging
Error signalled by MACSYMA-TOP-LEVEL.
Broken at MACSYMA-TOP-LEVEL.  Type :H for Help.
MAXIMA>>

Am I doing something wrong?

Thanks,

Petr.