Python xml parsing issue

Could you explain the error below to me and give me a workaround?

Thanks in advance!

Python 2.4.3 (#1, Apr 14 2011, 20:41:59)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-50)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from xml.sax import make_parser
>>> p = make_parser()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib64/python2.4/site-packages/_xmlplus/sax/sax2exts.py", line 37, in make_parser
    return XMLParserFactory.make_parser(parser_list)
  File "/usr/lib64/python2.4/site-packages/_xmlplus/sax/saxexts.py", line 75, in make_parser
    sys.modules[parser_name].create_parser = _create_parser
KeyError: 'xml.sax.drivers2.drv_pyexpat'
>>>