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Your suggestion seems to work, thanks. Anyway I had to update my packages, use utf8x instead of utf8, and add british to the languages.

I found out that the problem lies in the hebrew and greek packages. If I remove them I can compile correctly. The problem is that I need to use those two languages.

I also tried to use the \wrapfig package, creating an image .eps of the letter I need to use, but I obtained another error. If I ...

Since I have a problem using babel with lettrine, I found out a way to use initial letters as lettrine does, but I can't place the text nicely around the capital letter, as shown below:

\documentclass[dvips,a4paper,greek,hebrew,italian,10pt]{book}

\usepackage{ucs}
\usepackage[utf8]{inputenc ...

This is the preamble I use:

\documentclass[dvips,a4paper,greek,hebrew,italian,10pt]{book}

\usepackage{ucs}
\usepackage[utf8]{inputenc}
\usepackage[LGR,HE8,T1]{fontenc}
\def\HeblatexEncoding{HE8}
\def\HeblatexEncodingFile{he8enc}


\makeatletter
\let\l@hebrew\l@nohyphenation
\makeatother ...

I don't Know why, but every time I compile (pdftexify) using both lettrine and babel packages, I get the error "! Missing number, treated as zero". If I remove babel everything works as it should. Unfortunately in my document I need the babel package. Any solution?
Thanks