when I try \usepackage{subcaption} immediately at the beginning of my document I get an error:

Command \c@subfigure already defined

What can I do?

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Please add a minimal working example (MWE) that illustrates your problem. –  egreg Oct 14 '12 at 15:37
I guess we need more information. Which class are you using? Which packages do you load? –  Qrrbrbirlbel Oct 14 '12 at 15:38

It seems that two packages define this counter. Ensure that you only load the required packages. Here, with subcaption load caption before, but not subfigure or subfig, which do a similar job but are not required if you already use subcaption, as mentioned.

Already loading subfig and then subfigure produces this error. MWE:

\documentclass{article}
\usepackage{subfig}
\usepackage{subfigure}
\begin{document}
text
\end{document}


To sum up: just load the needed package(s), and remove unnecessary packages.

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Thanks it worked, but first I had to do a Clean All before I called Latex –  mljrg Oct 14 '12 at 22:32