[pstricks] PSTricks conflicts with beamer class?

[Paul Smith]

Dear All

I am beginning with using PSTricks, which I find quite interesting. I
have made some successful experiments. However, when I try to use
PSTricks together with beamer class, I get the conflict below. My
preamble is:

\usepackage{logictheme}
\usepackage{mathpazo} 
\usepackage{pst-plot}

If I coment the line 

\usepackage{pst-plot}

there is no error when I run the command latex.

Any ideas?

Regards,

Paul
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This is TeX, Version 3.14159 (Web2C 7.4.5)
(./file.tex
LaTeX2e <2001/06/01>
Babel <v3.7h> and hyphenation patterns for american, french, german, ngerman, b
asque, italian, portuges, russian, spanish, nohyphenation, loaded.
(/usr/share/texmf/tex/latex/beamer/base/beamer.cls
Document Class: beamer 2004/07/06 v2.21 Class for Typesetting a Beamer Presenta
tion
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For additional information on amsmath, use the `?' option.
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(/usr/share/texmf/tex/latex/base/latin1.def)) (./logictheme.sty)
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(/usr/share/texmf/tex/latex/pstricks/pst-plot.sty
(/usr/share/texmf/tex/generic/pstricks/pst-plot.tex  v97 patch 2, 1999/12/12
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`PSTricks' v97 patch 14  <1999/12/23> (tvz)
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