Problem with Yahoo Transport from xmpppy.sourceforge.net

I want install yahoo transport that comes from xmpppy.sourceforge.net, but when I run

python yahoo.py

and this messages appear :

Traceback (most recent call last):
File "yahoo.py", line 1153, in ?
userfile = shelve.open(userfilepath)
File "/usr/lib/python2.4/shelve.py", line 231, in open
return DbfilenameShelf(filename, flag, protocol, writeback, binary)
File "/usr/lib/python2.4/shelve.py", line 212, in __init__
Shelf.__init__(self, anydbm.open(filename, flag), protocol, writeback, binary)
File "/usr/lib/python2.4/anydbm.py", line 83, in open
return mod.open(file, flag, mode)
File "/usr/lib/python2.4/dbhash.py", line 16, in open
return bsddb.hashopen(file, flag, mode)
File "/usr/lib/python2.4/bsddb/__init__.py", line 291, in hashopen
e = _openDBEnv()
File "/usr/lib/python2.4/bsddb/__init__.py", line 345, in _openDBEnv
e.open('.', db.DB_PRIVATE | db.DB_CREATE | db.DB_THREAD | db.DB_INIT_LOCK | db.DB_INIT_MPOOL)
bsddb._db.DBError: (38, 'Function not implemented -- process-private: unable to initialize environment lock: Function not implemented')
Exception exceptions.AttributeError: "DbfilenameShelf instance has no attribute 'writeback'" in ignored

Any idea where the problem is ?

antoro