Ceci est une ancienne révision du document !
Que signifie l'erreur: « Missing \begin{document} »?
- Message:
Missing \begin{document} - Origine: LaTeX.
Cette erreur survient lorsqu'on compose quelque chose dans le préambule du document.
La plupart du temps, cette erreur est due à une déclaration mal interprétée par 
.
Elle peut également être produite par un texte sur la même ligne que \begin{filecontents}.
\sbox ou \savebox est possible,
mais il est plus prudent de placer ce type de déclarations après \begin{document},
car certaines extensions peuvent repousser leurs initialisations finales jusqu'à cet emplacement.
The preamble of your document is the stuff before
\begin{document}; you put \usepackage commands and
your own macro definitions in there. LaTeX doesn't like
typesetting anything in the preamble, so if you have:
- typed the odd grumble,
- created a box with
\newsaveboxand put something in it using\sbox(or the like), - forgotten to put
\begin{document}into the document, at all, or even - gave it the wrong file
the error is inevitable and the solution is simple — judicious use
of comment markers (%) at the beginning of a line, moving things around,
providing something that was missing … or switching to the correct file.
The error may also occur while reading the aux file from an
earlier processing run on the document; if so, delete the
aux file and start again from scratch. If the error
recurs, it could well be due to a buggy class or package.
However, it may be that none of the above solves the problem.
If so, remember that things that appear before \documentclass are
also problematical: they are inevitably before \begin{document}!
Unfortunately, modern editors are capable of putting things there, and preventing you from seeing them. This can happen when your document is being “written” in Unicode. The Unicode standard defines “Byte Order Marks” (BOM), that reassure a program (that reads the document) of the way the Unicode codes are laid out. Sadly ordinary LaTeX or pdfLaTeX choke on BOMs, and consider them typesetting requests. The error message you see will look like:
! LaTeX Error: Missing \begin{document}.
...
l.1 <?>
<?><?>\documentclass{article}
(Those <?>s are your operating system's representation of an
unknown character; on the author's system it's a reverse video
? sign.)
You can spot the BOM by examining the bytes; for example, the
Unix hexdump application can help:
$ hexdump -C <file> 00000000 ef bb bf 5c 64 6f 63 75 ...
The 5c 64 6f 63 75 are the \docu at the start of
(the “real” part of) your document; the three bytes before it form the
BOM.
How to stop your editor from doing this to you depends, of course, on
the editor you use; if you are using GNU Emacs, you have to
change the encoding from utf-8-with-signature to “plain”
utf-8; instructions for that are found on
the "stack overflow" site
(So far, all instances of this problem that the author has seen have afflicted GNU Emacs users.)
Fortunately XeTeX and LuaTeX know about BOMs and what to
do with them, so LaTeX using them is “safe”.
Sources:
- LaTeX Companion, 2e édition, Frank Mittelbach, Michel Goossens, Johannes Braams, David Carlisle, Chris Rowley (Pearson, 2006) ; ISBN: 978-2-7440-7182-9. Annexe B, Détecter et résoudre les problèmes, reproduite avec l'aimable autorisation de l'éditeur.
