[Twisted-Python] sshclient and sshserver examples

[Selwyn McCracken]

hi,

I am trying to run the sshsimpleclient.py from the CVS examples folder.
However I get the following error. 

Traceback (most recent call last):
  File "/home/selwyn/.ssh/sshClient.py", line 44, in ?
    class TrueChannel(connection.SSHChannel):
AttributeError: 'module' object has no attribute 'SSHChannel'

rummaging around in connection, there doesn't appear to be the
appropriate class available.

Help greatly appreciated.
Selwyn