Ideas??? Buildbot complains...

Following twistd.log until startup finished..
2008/07/03 20:26 CDT [-] Log opened.
2008/07/03 20:26 CDT [-] twistd 2.2.0 (/usr/bin/python 2.5.2) starting up
2008/07/03 20:26 CDT [-] reactor class: twisted.internet.selectreactor.SelectReactor
2008/07/03 20:26 CDT [-] Loading buildbot.tac...
2008/07/03 20:26 CDT [-] Loaded.
2008/07/03 20:26 CDT [-] loading configuration from /home/buildmaster/APP/master.cfg
2008/07/03 20:26 CDT [-] error while parsing config file
2008/07/03 20:26 CDT [-] error during loadConfig
2008/07/03 20:26 CDT [-] Traceback (most recent call last):
 File "/usr/lib/python2.5/site-packages/twisted/scripts/twistd.py", line 182, in startApplication
   app.startApplication(application, not config['no_save'])
 File "/usr/lib/python2.5/site-packages/twisted/application/app.py", line 298, in startApplication
   service.IService(application).startService()
 File "/usr/lib/python2.5/site-packages/twisted/application/service.py", line 196, in startService
   service.startService()
 File "/usr/lib/python2.5/site-packages/buildbot/master.py", line 407, in startService
   self.loadTheConfigFile()
--- ---
 File "/usr/lib/python2.5/site-packages/buildbot/master.py", line 462, in loadTheConfigFile
   self.loadConfig(f)
 File "/usr/lib/python2.5/site-packages/buildbot/master.py", line 480, in loadConfig
   exec f in localDict
 File "/home/buildmaster/APP/master.cfg", line 4, in
   from buildbot.process import step, factory
: cannot import name step

2008/07/03 20:26 CDT [-] The new config file is unusable, so I'll ignore it.
2008/07/03 20:26 CDT [-] I will keep using the previous config file instead.