[pstricks] Error using pst-light3d.tex

[John Culleton]

Following one example in the documentation I created this plain tex 
file:
-----------------------------------------
\input pstricks
\input pst-light3d.tex
\input \font\Rmb ptmr8r at 40pt
 \PstLightThreeDText[linestyle=none,fillstyle=solid,fillcolor=red,%
LightThreeDColorPsCommand =%
 1.2 div 0.15 exch 0.7 exch sethsbcolor]{\Rmb Scribus}
\bye
-----------------------------------------
gnerating this error:

-- (/usr/local/texlive/2007/texmf-dist/tex/latex/xkeyval/keyval.tex)))
! Undefined control sequence.
l.21 \pst
         @addfams{pst-light3d}
------------------------------------
What stupid mistake have I made? 

John Culleton