How to use Python's twisted.internet for XBMC add-on development?

Question

I just tried to use the Python module twisted.internet for an XBMC add-on that I am currently writing. When I tried to execute my add-on, I got an exception that I could not understand. I was quite suprised when I noticed that the following lines were causing all the troubles:

import xbmc, xbmcgui, xbmcaddon # Can be removed; doesn't change anything.
from twisted.internet import reactor, defer

Question: How can I use twisted for the development of my XBMC add-on? Any help would be appreciated!

Unfortunately, I am new to both, XBMC and twisted and there are little more details that I can provide. I think that the addon is not executed in the main thread. I am using XBMC 11 for testing at the moment. (Update: I am using the most recent Debian testing packages of XBMC, Python and twisted. Importing and using the module works from regular scripts and from an XBMC service, but not from XBMC scripts.) The stacktrace from the xbmc.log file is:

File "/home/markus/.xbmc/addons/script.marmay.wol/timewol.py", line 2, in <module>
  from twisted.internet   import  reactor, defer
File "/usr/lib/python2.7/dist-packages/twisted/internet/reactor.py", line 37, in <module>
  from twisted.internet import default
File "/usr/lib/python2.7/dist-packages/twisted/internet/default.py", line 50, in <module>
  install = _getInstallFunction(platform)
File "/usr/lib/python2.7/dist-packages/twisted/internet/default.py", line 44, in _getInstallFunction
  from twisted.internet.pollreactor import install
File "/usr/lib/python2.7/dist-packages/twisted/internet/pollreactor.py", line 19, in <module>
  from zope.interface import implements
File "/usr/lib/python2.7/dist-packages/zope/interface/__init__.py", line 58, in <module>
  _wire()
File "/usr/lib/python2.7/dist-packages/zope/interface/interface.py", line 805, in _wire
  classImplements(Attribute, IAttribute)
File "/usr/lib/python2.7/dist-packages/zope/interface/declarations.py", line 447, in classImplements
  spec = implementedBy(cls)
File "/usr/lib/python2.7/dist-packages/zope/interface/declarations.py", line 318, in implementedByFallback
  if isinstance(spec, Implements):
TypeError: 'NoneType' object is not callable

This is the first relevant error message.

Thanks for your help!