[pstricks] Error message from pstricks-add

[Hiroshi Ina]

Hi,
This is my first time to post messages to the Pstricks mailing.

Two days ago, I installed the latest PStricks system. I am testing it with
various examples.

I am having a problem with the example of pst-plot and pstricks-add that
is seen at http://tug.org/PSTricks/pst-plot/gauss0.tex.

Below , I am attaching the LaTeX source as it is and the error message I got.
I'd appreciate it if someone could help me find the problem.

Best Regards,
  H.I

============= LaTeX source from http://tug.org/PSTricks/pst-plot/gauss0.tex
\listfiles
\documentclass[12pt,a4paper]{article} % Herbert Voss <voss at perce.de> 2004-06-26

\usepackage{pst-plot}
\usepackage{pstricks-add}
\usepackage{amsmath}

\begin{document}

\psset{yunit=4cm,xunit=4}
\begin{pspicture}(-2,0)(2,1)
%  \psgrid[griddots=10,gridlabels=0pt, subgriddiv=0]
  \psaxes[xyLabel=\footnotesize,Dy=0.25]{->}(0,0)(-2,0)(2,1)
  \uput[-90](2,0){x}\uput[0](0,1){y}
  \rput[lb](1,0.75){$\sigma =0.5$}
  \rput[lb](-2,0.5){$f(x)=\dfrac{1}{\sigma\sqrt{2\pi}}\,e^{-\dfrac{x^2}{2\sigma{}^2}}$}
  \psplot[linecolor=red, linewidth=2pt]{-1.8}{1.8}{%
    /sigma 0.5 def
    /e 2.718282 def
    /C 1 sigma div 6.2831 sqrt div def
    e x dup mul 2 div sigma dup mul div neg exp C mul}
\end{pspicture}

\end{document}
=======================================================



===== Error messages ===================================
! Package xkeyval Error: `xyLabel' undefined in families `,pstricks-add'.

See the xkeyval package documentation for explanation.
Type  H <return>  for immediate help.
 ...

l.13 ...\footnotesize,Dy=0.25]{->}(0,0)(-2,0)(2,1)
========================================================

====Output of \listfiles command ========================
 *File List*
  pldefs.ltx    2000/07/13 v1.2 pLaTeX Kernel (Default settings)
   jy1mc.fd    1997/01/24 v1.3 KANJI font defines
   jy1gt.fd    1997/01/24 v1.3 KANJI font defines
   jt1mc.fd    1997/01/24 v1.3 KANJI font defines
   jt1gt.fd    1997/01/24 v1.3 KANJI font defines
 kinsoku.tex
 plpatch.ltx
 article.cls    2004/02/16 v1.4f Standard LaTeX document class
  size12.clo    2004/02/16 v1.4f Standard LaTeX file (size option)
pst-plot.sty    2004/07/15 package wrapper for pst-plot.tex
pstricks.sty    2005/12/19 v0.31 LaTeX wrapper for `PSTricks' (RN,HV)
pstricks.tex    2005/12/22 v1.14 `PSTricks' (tvz)
   color.sty    1999/02/16 v1.0i Standard LaTeX Color (DPC)
   color.cfg
   dvips.def    1999/02/16 v3.0i Driver-dependant file (DPC,SPQR)
dvipsnam.def    1999/02/16 v3.0i Driver-dependant file (DPC,SPQR)
pst-plot.tex    93/01/14 1.4 `pst-plot' (tvz)
pstricks-add.sty    2005/03/03 package wrapper for pstricks-add.tex (hv)
pstricks-add.tex    2005/12/28 v2.73 `PSTricks-add' (hv)
pst-xkey.tex    2005/11/25 v1.6 PSTricks specialization of xkeyval (HA)
 xkeyval.sty    2005/11/25 v2.5e package option processing (HA)
 xkeyval.tex    2005/11/25 v2.5e key=value parser (HA)
 amsmath.sty    2000/07/18 v2.13 AMS math features
 amstext.sty    2000/06/29 v2.01
  amsgen.sty    1999/11/30 v2.0
  amsbsy.sty    1999/11/29 v1.2d
  amsopn.sty    1999/12/14 v2.01 operator names
 ***********