# Missing begin document in latex file with multiple chapters

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:

\documentclass[pdftex,12pt]{report}
% all required packages

\usepackage{graphicx}
\usepackage[utf8]{inputenc}
\usepackage[document]{ragged2e}

\renewcommand{\chaptermark}[1]{%
\markboth{#1}{\thechapter\ #1}}
\renewcommand{\sectionmark}[1]{%
\markright{\thesection\ #1}}

\newcommand{\HRule}{\rule{\linewidth}{0.5mm}}
\begin{document}
\pagestyle{fancy}
\setcounter{page}{1}
\pagenumbering{roman}
\cleardoublepage
\pagestyle{fancy}
\setcounter{page}{1}
\pagenumbering{arabic}
\chapter{Introduction}
\input{A-Introduction/Introduction}
\chapter{Preliminaries and Notions}
\input{B-Preliminaries/Preliminaries}
\chapter{Backbone Colouring}
\input{C-Studysofar/Studysofar.tex}
\chapter{Algorithm for Finding Backbone}
\input{D-Mine/Mine.tex}
\chapter{Conclusion}
\input{E-Conclusion/Conclusion.tex}

\doublespacing
\listoffigures
\end{document}


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 +
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)
)

• 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
• 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
• 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
• 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
• 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.
• @IanThompson bring back w3-mode .. – David Carlisle Jun 12 '15 at 19:57