当我尝试一个简单表达式时,sphinx.ext.pngmath会引发一个错误

我在用 Sphinx 创建我的项目的文档。我想用分机 Sphinx.ext.pngmath公司 通过这个小小的测试:

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

我得到了错误:

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.

我已经安装了TexLive乳胶底座。

谢谢您, 鲁比克