Interesting point is that until yesterday I ran this code easily without getting any error but suddenly it keep sending the error of missing begin document. I see some similar question and it was suggested to copy the file as some special format and I don't know how to do that. My file has multiple chapters and I type other part of my works in 5 other latex file. Would you please help me with that? thanks Here is my code:

% all required packages


           \markboth{#1}{\thechapter\ #1}}
            \markright{\thesection\ #1}}

    \chapter{Preliminaries and Notions}
    \chapter{Backbone Colouring}
    \chapter{Algorithm for Finding Backbone}

\addcontentsline{toc}{chapter}{Table of Figures}

and here is the error that I got, I copy and paste the part of it:

   ! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
l.1 +
% Copyright (c) 2012
You're in trouble here. Try typing <return> to proceed.
If that doesn't work, type X <return> to quit.
Missing character: There is no + in font nullfont!
Overfull \hbox (20.0pt too wide) in paragraph at lines 1--5
("C:\Program Files (x86)\MiKTeX 2.9\tex\latex\base\report.cls"
Document Class: report 2007/10/19 v1.4h Standard LaTeX document class
("C:\Program Files (x86)\MiKTeX 2.9\tex\latex\base\size12.clo"
File: size12.clo 2007/10/19 v1.4h Standard LaTeX file (size option)
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    Please reduce your code to a minimal example that reproduces the problem. That will make it easier for others to help you. – Ian Thompson Jun 12 '15 at 15:32
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    Ok, you can see the error follow this proccess: make a copy of your file, and add the code little by little (running the code) until appears some error. – juanuni Jun 12 '15 at 15:33
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    You have posted your (far too long) example twice and not posted the error message. after "and here is the error that I got, I copy and paste the part of it:" – David Carlisle Jun 12 '15 at 15:40
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    What does this mean: "Actually when I run each of these 5 files separately everything is fine."? Do the \input-ed files work on their own? If so, you probably can't simply \input them.... – jon Jun 12 '15 at 15:47
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    The error message clearly shows the problem you have a stray + before the copyright comment – David Carlisle Jun 12 '15 at 15:53

You have a + on line one of your file which is not in a comment so TeX tries to typeset it before the \documentclass (and before \begin{document}). Hence the error message.

| improve this answer | |
  • An accidental click. Not sure how that happened. I'll remove it when I can. – Ian Thompson Jun 12 '15 at 16:45
  • @IanThompson If David edits this, you'll be able to reverse the damage :) Perhaps a MWE could be added that shows the obvious problem and produces the same error. – Sean Allred Jun 12 '15 at 17:16
  • @IanThompson :-) – David Carlisle Jun 12 '15 at 19:22
  • @DavidCarlisle --- I blame these GUI driven websites. If only everything worked using emacs shortcuts... – Ian Thompson Jun 12 '15 at 19:29
  • @IanThompson bring back w3-mode .. – David Carlisle Jun 12 '15 at 19:57

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