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The situation it's a bit complicated. I'm loading the packages through the
classicthesis-config.tex file, provided with the style file, adding the packages I need.
That file is loaded with \input{} after the \documentclass call.
This is the whole file:

\PassOptionsToPackage{floatperchapter ...

I am writing my thesis with the classicthesis style, I compile using pdflatex
in TeX Live 2010.
I run into the following error:
Package array Error: Empty preamble: `l' used.

The error is generated by the code:

\begin{equation*}
g_{\mu\nu}=
\begin{pmatrix}
1 & 0 & 0 & 0 \\
0 & -1 & 0 & 0 \\
0 ...

Same error... Is it possible to do it without using this package?

I need to change the captions of certain figures in a document from "Figure" to "Diagram". I tried the caption package using the command "\captionsetup{name=Diagram}" where it was needed. Problem is that it generates an error and I don't know how to solve it.

Thank you.