[Tex/LaTex] TeXworks can’t compile any .tex document

compilingtexworks

I've just installed TeXworks on new computer (with ubuntu 10.4). It seems all required texlive packages are installed, in any case I can compile .tex documents using terminal. But in TeXworks while trying to run pdfLaTeX appears: 

This is pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009/Debian)
 restricted \write18 enabled.
entering extended mode
(./Szarfi.tex
! Undefined control sequence.
l.2 \documentclass
                  {book}
?

Preamble is: 

%& --translate-file=utf-8
\documentclass{book}
\usepackage[polish]{babel}
\usepackage[T1]{fontenc}
\usepackage[utf8x]{inputenc}
\begin{document} 

here goes the text

\end{document}

I've uninstalled and installed once again TeXworks, the problem persist. I had before more general problem with the system, I thought I've resolved it with help of askubuntu, the thread is here: https://askubuntu.com/questions/28195/untrusted-packages-could-compromise-your-systems-security-appears-while-tryin, I don't know if there is any connection between those problems.

Thanks in advance for any suggestions

Best Answer

Did you select pdfLaTeX next to the compilation button? The default in the TeXworks version in Ubuntu 10.04 is pdfTeX, which won't compile LaTeX documents.

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