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It worked! Thank you so much. I can't explain how grateful I am.

I can see that the problem is caused by using \underbar in the definition of \@sect of fbe_tez.sty .

Here's a patch using etoolbox, which replaces it by \underline . Just write in your preamble:

\usepackage{etoolbox ...

I've noticed that in the example I've written subsection instead of subsubsection.
Reposting the example with the .log file.
\documentclass[a4paper,onesided,12pt]{report}
\usepackage{styles/fbe_tez}

\usepackage{inputenc}
\renewcommand{\labelenumi}{(\roman{enumi})}
\usepackage{amsmath, amsthm ...

Thanks for your time. The file is attached.

Stefan_K wrote:There's no problem in this code, it works, except that I don't have the fbe_tez package for testing.

Can you please post styles/fbe_tez.sty, as attachment to a post?

Stefan

I tried a few lines and some different chapters and sections also. Every time I get the same error. But I actually want to use it like that:
\documentclass[a4paper,onesided,12pt]{report}
\usepackage{styles/fbe_tez}

\usepackage{inputenc}
\renewcommand{\labelenumi}{(\roman{enumi})}
\usepackage ...

I'm a newbie, so I don't know the rules very much. I'm sorry and thanks for the notice.
Just so that everybody knows: this question has been asked on TeX.SE as well.

@ ahuakdemir : see section 4.1 of the board rules :
A crossposting is always contra-productive. But there is nothing really against ...

Hello,

I am using xcolor package to draw some colored tables. But I am having trouble with the \subsubsection command.

When I block comment the colored tables and xcolor package, it works. When I do not use any \subsubsection , it works. But when I use both at the same time, I get the following ...