[Zope] Parsing with sax

[redes13@hosting.securesites.it]

Hello,
 I had an application, on a computer with zope's installation for Windows, that 
uses xml and to parsing a file it uses the parseString() function.
All the application on Windows run, but when I've put this application on the 
zope's installation for Linux, it give me this error:

Error Type: AttributeError
Error Value: 'xml.sax.expatreader' module has no attribute 'create_parser'

Please, Is there someone that can help me?