La génération automatique d'affiche a rencontré un problème:
This is pdfTeXk, Version 3.141592-1.40.3 (Web2C 7.5.6)
 %&-line parsing enabled.
entering extended mode
(/tmp/poster.tex
LaTeX2e <2005/12/01>
Babel  and hyphenation patterns for english, usenglishmax, dumylang, noh
yphenation, arabic, basque, bulgarian, coptic, welsh, czech, slovak, german, ng
erman, danish, esperanto, spanish, catalan, galician, estonian, farsi, finnish,
 french, greek, monogreek, ancientgreek, croatian, hungarian, interlingua, ibyc
us, indonesian, icelandic, italian, latin, mongolian, dutch, norsk, polish, por
tuguese, pinyin, romanian, russian, slovenian, uppersorbian, serbian, swedish, 
turkish, ukenglish, ukrainian, loaded.
(/usr/share/texmf/tex/latex/base/article.cls
Document Class: article 2005/09/16 v1.4f Standard LaTeX document class
(/usr/share/texmf/tex/latex/base/size11.clo))
(/usr/share/texmf/tex/latex/base/inputenc.sty
(/usr/share/texmf/tex/latex/base/latin1.def))
(/usr/share/texmf/tex/generic/babel/babel.sty
(/usr/share/texmf/tex/generic/babel/frenchb.ldf
(/usr/share/texmf/tex/generic/babel/babel.def)
*************************************
* Local config file frenchb.cfg used
*
(/usr/share/texmf/tex/generic/babel/frenchb.cfg))) (./poster.aux)
(/usr/share/texmf/tex/latex/lm/t1lmr.fd)
Underfull \hbox (badness 10000) in paragraph at lines 43--45


Underfull \hbox (badness 10000) in paragraph at lines 64--64


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Underfull \hbox (badness 10000) in paragraph at lines 71--88

[1]
! Misplaced alignment tab character &.
l.89 ...éâtre Léon Motchane( Cours de l'IHES )\\S&
                                                  eacute;minaire de physique...

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! Emergency stop.
l.89 ...éâtre Léon Motchane( Cours de l'IHES )\\S&
                                                  eacute;minaire de physique...

Output written on poster.dvi (1 page, 2660 bytes).
Transcript written on poster.log.

Si vous en avez la possibilité, merci de bien vouloir corriger les informations erronées.