sphinx.ext.pngmath raise an error when I try a simple expression

I'm using Sphinx to create the documentation of my project. I want to use the extension sphinx.ext.pngmath and with this little test:

    Returns the indefinite integral of the polynomial *poly*:
    .. math::
        \int p(x)dx

I got the error:

WARNING: inline latex u'\\int p(x)dx\n\n': latex exited with error:             
[stderr]

[stdout]
This is pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009/Debian)
 restricted \write18 enabled.
entering extended mode
(./math.tex
LaTeX2e <2009/09/24>
Babel <v3.8l> and hyphenation patterns for english, usenglishmax, dumylang, noh
yphenation, loaded.
(/usr/share/texmf-texlive/tex/latex/base/article.cls
Document Class: article 2007/10/19 v1.4h Standard LaTeX document class
(/usr/share/texmf-texlive/tex/latex/base/size12.clo))
(/usr/share/texmf-texlive/tex/latex/base/inputenc.sty

! LaTeX Error: File `utf8x.def' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: def)

Enter file name: 
! Emergency stop.
<read *> 

l.131 \endinput
               ^^M
No pages of output.
Transcript written on math.log.

I have installed the package texlive-latex-base.

Thank you, rubik

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sphinx.ext.pngmath raise an error when I try a simple expression

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