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When trying to run package Prosper (or slides), I get the error message that 

("C:\Program Files\MiKTeX 2.9\tex\latex\graphics\keyval.sty"
Package: keyval 1999/03/16 v1.13 key=value parser (DPC)
\KV@toks@=\toks21
)))
! Undefined control sequence.
\pst@addfams #1->\XKV@for@n 
                            {#1}\XKV@tempa {\@expandtwoargs \in@ {,\XKV@temp...
l.66 \pst@addfams{pstricks}

The line in pstricks.tex that seems to be the problem is 

%
% now we have all commands defined, for TeX and LaTeX
%
\ifx\PSTXKeyLoaded\endinput\else \input pst-xkey.tex \fi
\pst@addfams{pstricks}                                     <----- seems to hang up on this
\ifx\PSTFPloaded\endinput\else   \input pst-fp.tex\fi
%
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3  
Please provide a minimal working example (MWE) that illustrates your problem. – Werner Apr 11 '12 at 20:04
1  
As well, include the versions of your pdftex, and packages pstricks and keyval. – tohecz Apr 11 '12 at 21:29

closed as too localized by Marco Daniel, egreg, Torbjørn T., Stefan Kottwitz♦ May 5 '12 at 22:43

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