A0 poster error code [closed]

Question

I submit to the wisdom of forumers this request. I'm very disturbed by this error code:

 ! LaTeX Error: Option clash for package color.

    See the LaTeX manual or LaTeX Companion for explanation.
    Type  H <return>  for immediate help.
    ...                                              

l.51 

And as suggest by thorsten and Daniel E. Shub there is the minimal code source with another error:

    ! LaTeX Error: File `rsda2012' not found.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.278 \end{minipage}}

? x

A minimal working example might be:

\documentclass[portrait,a0b,final,a4resizeable]{a0poster}
    \usepackage{pstricks}
    \usepackage[dvips]{color}

    \begin{document}
     \begin{poster}

%%%%%%%%%%%%%%%%%%%%%
%%% Header
%%%%%%%%%%%%%%%%%%%%%
\begin{center}

\begin{pcolumn}{0.98}
\pbox{0.95\textwidth}{}{linewidth=2mm,framearc=0.3,linecolor=lightblue,fillstyle=gradient,gradangle=0,gradbegin=white,gradend=whiteblue,gradmidpoint=1.0,framesep=1em}{\begin{minipage}[c][9cm][c]{0.1\textwidth}
  \begin{center}
  \includegraphics[width=6cm,height=8cm]{univ}
  \end{center}
\end{minipage}
%%% Titre
\begin{minipage}[c][9cm][c]{0.78\textwidth}
\begin{center}
{\sc \Huge \blue
    Equation différentielle dirigée par un mouvement Brownien fractionnaire}\\[10mm]
    {\Large LABAIR Abdelkader \\[7.5mm]
   Laboratoire de Mathématiques, Université Djillali Liabes, Sidi Bel Abbes.}
  \end{center}
\begin{flushright}
   \includegraphics[width=6cm,height=8cm]{rsda2012}
\end{flushright}
\end{minipage}}
\end{pcolumn}
\end{center}
\end{poster}
    \end{document}

Sincerely

Answer 1

In an effort to help Labair get an answer, I think his MWE can be significantly reduced. I can recreate the error with:

\documentclass{article}
\usepackage{pstricks}
\usepackage[dvips]{color}

\begin{document}
\end{document}

The simple solution to resolve the error appears to be to load color before pstricks

\documentclass{article}
\usepackage[dvips]{color}
\usepackage{pstricks}

\begin{document}
\end{document}