[pstricks] Listplot problem

[Hernando Diaz]

Hi everyone.
While using \listplot with the bar option, I keep getting an error message
    Undefined control sequence. \pst@@hlabels -> \psDEBUG
    Undefined control sequence. \pst@@vlabels -> \psDEBUG
The ticks on the axes are correctly placed, but the horizontal and 
vertical labels are placed after a sign that reads
    [pst@@vlabels]xticksizeC=-4.0pt.

Could anyone please help?

Here is a minimal example:
\listfiles
\documentclass[12pt]{minimal}
\usepackage{pstricks,pstricks-add}
\begin{document}
\savedata{\mydata}[{{1, 0.0104},{2,0.052},{3,0.375},{4,0.531},{5,0.031}}]
\psset{xunit=1cm,yunit=5cm}
\begin{center}
    \begin{pspicture}(-.5,3)(5.5,1)
        \psaxes[Ox=1,Oy=0,Dx=1,Dy=0.5]{}(5,1)
        
\listplot[shadow=false,linecolor=blue,plotstyle=bar,barwidth=0.6cm,fillcolor=red,fillstyle=solid]{\mydata}
    \end{pspicture}
\end{center}
\end{document}

And my file list:
 *File List*
 minimal.cls    2001/05/25 Standard LaTeX minimal class
pstricks.sty    2006/08/10 v0.32 LaTeX wrapper for `PSTricks' (RN,HV)
pstricks.tex    2006/12/22 v1.15 `PSTricks' (tvz)
  xcolor.sty    2007/01/21 v2.11 LaTeX color extensions (UK)
   color.cfg    2005/12/29 v1.1 MiKTeX 'color' configuration
   dvips.def    1999/02/16 v3.0i Driver-dependant file (DPC,SPQR)
pstricks-add.sty    2005/03/03 package wrapper for pstricks-add.tex (hv)
pstricks-add.tex    2008/06/12 v3.05 `PSTricks-add' (hv,dr)
pst-xkey.tex    2005/11/25 v1.6 PSTricks specialization of xkeyval (HA)
 xkeyval.sty    2006/11/18 v2.5f package option processing (HA)
 xkeyval.tex    2006/11/18 v2.5f key=value parser (HA)
 ***********

Thanks a  lot,
Hernando Diaz
National University of Colombia