Error executig gnue-forms with first appserver example

After installation succeeded at least, I tried to start the first example 
application from the appserver. Unfortunately  I just got a window with a 
very long traceback. I put here just the end of it. If you need more of it, 
to dive in the problem, please let me know.

Thilo

   File "/opt/gnue/lib/python2.
5/site-packages/gnue/common/rpc/drivers/xmlrpc/ClientAdapter.py", line 191, in 
_callMethod_
    self._verbose)
   File "/opt/gnue/lib/python2.
5/site-packages/gnue/common/rpc/drivers/xmlrpc/ClientAdapter.py", line 100, in 
request
    p, u = self.getparser ()
   File "/usr/lib/python2.5/xmlrpclib.py", line 1210, in getparser
    return getparser(use_datetime=self._use_datetime)
 AttributeError: PersistentTransport instance has no attribute '_use_datetime'