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I have a problem in disappearing the Index!! it doesn't work; this is the begining of my code:
\documentclass[12pt,oneside,a4paper,french]{book}
\usepackage{babel}
\usepackage{setspace}
\setstretch{1,3}
\usepackage{enumerate}
%\usepackage{float}
\usepackage{tikz}
\usepackage[latin1]{inputenc ...

pdfTeX warning (ext4): destination with the same identifier (name{page.1}) has
been already used, duplicate ignored
It seems, you've two pages with the logical number 1. This often happens, if users use a \pagenumbering{arabic} (without having a \pagenumbering{roman} or similar before) or ...

Do you have a file caption.sty in your document directory? If yes, then delete it or rename it. Seems there is an old version. From the .log file:

(caption.sty
Package: caption 2012/02/19 v3.2f Customizing captions (AR)

("C:\Users\...\AppData\Local\Programs\MiKTeX 2.9\tex/latex/caption\caption3 ...

Do you have a file caption.sty in your document directory? If yes, then delete it or rename it. Seems there is an old version. From the .log file:

(caption.sty
Package: caption 2012/02/19 v3.2f Customizing captions (AR)

("C:\Users\...\AppData\Local\Programs\MiKTeX 2.9\tex/latex/caption\caption3 ...

.log file is as follows:

Stefan Kottwitz wrote:You could use \markboth{}{} or even \markboth{Conclusion}{Conclusion} at that place in the document.

Stefan

Thank you, it is work!

The document class line and you code brings the error:

! Undefined control sequence.
<recently read> \captionsetup

l.2 \captionsetup
[subfigure]{labelfont=rm}

The command \captionsetup is unknown. That's because you did not load the caption package. Add

\usepackage{caption}

before ...

Stefan Kottwitz wrote:And what is your document code, preamble, up to \begin{document}?

Stefan

\captionsetup[subfigure]{labelfont=rm}
\usepackage{fancyhdr}
\headsep = 1.0cm
\renewcommand{\headrulewidth}{0.2pt}% Default \headrulewidth is 0.4pt

\begin{document}

Stefan Kottwitz wrote:This can be a conflict of the caption package with your document class. Which document class are you using?

Stefan

\documentclass[12pt,twoside,a4paper,english]{book}

I am using packages and document class at preamble and at running time, latex editor gives following error. No idea what is happening:
'''''! LaTeX Error: Command \captionbox already defined.
Or name \end... illegal, '''''