Mod_python error: "PythonHandler cldispatcher"

Traceback (most recent call last):

  File "/usr/lib/python2.4/site-packages/mod_python/apache.py", line 299, in HandlerDispatch
    result = object(req)

  File "/home/httpd/sandonato.it/cldispatcher.py", line 83, in handler
    return handlerfunc(req)

  File "/home/httpd/sandonato.it/clresources/atom.py", line 90, in handler
    req.write(str(HTMLResource(req)))

  File "/home/httpd/sandonato.it/clresources/atom.py", line 78, in __str__
    e = atom.Entry().title(item['%stitle' % lang_visible]).link(

  File "/usr/lib/python2.4/site-packages/sgutility2/atom.py", line 82, in title
    return self.__append_tag('title', text=title)

  File "/usr/lib/python2.4/site-packages/sgutility2/atom.py", line 75, in __append_tag
    self.__entry.append(build_tag(tag, text, attrs, cData))

  File "/usr/lib/python2.4/site-packages/sgutility2/atom.py", line 22, in build_tag
    t.text = text

  File "etree.pyx", line 520, in etree._Element.text.__set__

UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 8: ordinal not in range(128)