字符集问题

文本 我使用diazo制作一个主题并在主题页面中添加中文“以ORACLE EBS为主要信息化研究平台，。”主题 可以正常导入并显示 。
当把内容改为“以ORACLE EBS为主要信息化研究平台，掌握国内外企业的财务、生产、采购、分销流程。”时就会报错误.
2012-04-07 09:53:27 ERROR plone.transformchain Unexpected error whilst trying to apply transform chain
Traceback (most recent call last):
File "/usr/local/Plone/buildout-cache/eggs/plone.transformchain-1.0.2-py2.6.egg/plone/transformchain/transformer.py", line 48, in __call__
newResult = handler.transformIterable(result, encoding)
File "/usr/local/Plone/buildout-cache/eggs/plone.app.theming-1.0b8-py2.6.egg/plone/app/theming/transform.py", line 205, in transformIterable
transform = self.setupTransform()
File "/usr/local/Plone/buildout-cache/eggs/plone.app.theming-1.0b8-py2.6.egg/plone/app/theming/transform.py", line 150, in setupTransform
xsl_params=xslParams,
File "/usr/local/Plone/buildout-cache/eggs/diazo-1.0rc3-py2.6.egg/diazo/compiler.py", line 106, in compile_theme
read_network=read_network,
File "/usr/local/Plone/buildout-cache/eggs/diazo-1.0rc3-py2.6.egg/diazo/rules.py", line 147, in process_rules
rules_doc = expand_themes(rules_doc, parser, absolute_prefix, read_network)
File "/usr/local/Plone/buildout-cache/eggs/diazo-1.0rc3-py2.6.egg/diazo/rules.py", line 64, in expand_themes
theme_doc = etree.parse(url, parser=parser)
File "lxml.etree.pyx", line 2706, in lxml.etree.parse (src/lxml/lxml.etree.c:49958)
File "parser.pxi", line 1500, in lxml.etree._parseDocument (src/lxml/lxml.etree.c:71797)
File "parser.pxi", line 1529, in lxml.etree._parseDocumentFromURL (src/lxml/lxml.etree.c:72080)
File "parser.pxi", line 1429, in lxml.etree._parseDocFromFile (src/lxml/lxml.etree.c:71175)
File "parser.pxi", line 975, in lxml.etree._BaseParser._parseDocFromFile (src/lxml/lxml.etree.c:68173)
File "parser.pxi", line 539, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:64257)
File "parser.pxi", line 621, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:65146)
File "lxml.etree.pyx", line 230, in lxml.etree._ExceptionContext._raise_if_stored (src/lxml/lxml.etree.c:6821)
File "parser.pxi", line 427, in lxml.etree._local_resolver (src/lxml/lxml.etree.c:63267)
File "docloader.pxi", line 138, in lxml.etree._ResolverRegistry.resolve (src/lxml/lxml.etree.c:59952)
File "/usr/local/Plone/buildout-cache/eggs/plone.app.theming-1.0b8-py2.6.egg/plone/app/theming/utils.py", line 103, in resolve
result = result.decode(encoding).encode('ascii', 'xmlcharrefreplace')
File "/usr/local/Plone/Python-2.6/lib/python2.6/encodings/utf_8.py", line 16, in decode
return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xe5 in position 4245: invalid continuation byte


plone是用Plone-4.1.4-UnifiedInstaller.tgz安装的，OS版本是Fedora13 请帮忙 ！！