LaTeX forum ⇒ General ⇒ Package caption Error: For a successful cooperation we need at least version(caption) is available.\begin{document}

[sreemoyee07]

Package caption Error: For a successful cooperation we need at least version(caption) is available. \begin{document}
\caption will not be redefined since it's already(caption) redefined by a document class or package which is(caption) unknown to the caption package.

Please help how to solve this problem.

[cgnieder]

can you please show a minimal working example which produces this error? Otherwise we won't be able to say much.

The error message is produced by the caption package through its \caption@If@Package@Loaded command. This command is used two times by the caption package.

• Once for checking if the float package has been loaded and if its version is at least 2001/11/08 v1.3d and
• once for checking if the floatrow package has been loaded and its version is at least 2007/08/24 v0.2a

The error should mean that one of those packages has been loaded but is too old. This suggests that you probably have a rather old TeX distribution (the current version of float is from 2001 and the current version of floatrow from 2009!) and should update. But the real problem could be something different which we won't be able to tell without a minimal working example.

[sreemoyee07]

\documentclass[a4paper, 12pt,oneside]{book}
\input{Preamble_matter}
\usepackage{epstopdf}
\usepackage{caption}
\usepackage{subfigure}
\usepackage{indentfirst}
\begin{document}                                %error is occurring in this line 
%\input{Front_matter_new}

\markboth
 {\Headingsize \it Chapter 1: Introduction}
  {\Headingsize \it Chapter 1:Introduction}
\input{Introduction_chapter}

  \markboth
{\Headingsize \it Chapter 2: Synthesis Schemes}
{\Headingsize \it Chapter 2: Synthesis Schemes}
\input{chapter2}

[Stefan Kottwitz]

Welcome to the forum!

Can you please insert the command \listfiles into your document preamble, compile again, and post the .log file here as attachment?

Stefan