Hi I am trying to use Twisted and PB but running into the below error in the zope.interface module. I am running Python 3.3 and zope.interface version 4.0.3. I am running this on a RedHat system. Does anybody know how to get around this problem? bash-3.2$ python pb_client.py Traceback (most recent call last): File "pb_client.py", line 2, in <module> from twisted.spread import pb File "/home/abhat1/python3.3/lib/python3.3/site-packages/twisted/spread/pb.py", line 40, in <module> from twisted.cred.credentials import IAnonymous, ICredentials File "/home/abhat1/python3.3/lib/python3.3/site-packages/twisted/cred/credentials.py", line 111, in <module> class DigestedCredentials(object): File "/home/abhat1/python3.3/lib/python3.3/site-packages/twisted/cred/credentials.py", line 115, in DigestedCredentials implements(IUsernameHashedPassword, IUsernameDigestHash) File "/home/abhat1/python3.3/lib/python3.3/site-packages/zope/interface/declarations.py", line 405, in implements raise TypeError(_ADVICE_ERROR % 'implementer') TypeError: Class advice impossible in Python3. Use the @implementer class decorator instead.