PyMSNt: 'NoneType' object has no attribute 'lang'

I'm getting these error messages from PyMSNt trunk:

Unhandled error in Deferred:
Traceback (most recent call last):
  File "/usr/local/lib/python2.3/site-packages/twisted/internet/base.py", line 
423, in runUntilCurrent
    call.func(*call.args, **call.kw)
  File 
"/jabber/src/production/msn.jabber.cd.chalmers.se-filetransfer/src/tlib/msn/msnw.py",
 line 54, in timeout
    d.errback()
  File "/usr/local/lib/python2.3/site-packages/twisted/internet/defer.py", line 
274, in errback
    self._startRunCallbacks(fail)
  File "/usr/local/lib/python2.3/site-packages/twisted/internet/defer.py", line 
313, in _startRunCallbacks
    self._runCallbacks()
--- <exception caught here> ---
  File "/usr/local/lib/python2.3/site-packages/twisted/internet/defer.py", line 
338, in _runCallbacks
    self.result = callback(self.result, *args, **kw)
  File 
"/jabber/src/production/msn.jabber.cd.chalmers.se-filetransfer/src/legacy/glue.py",
 line 339, in connectionFailed
    text = lang.get(self.session.lang).msnConnectFailed % reason
exceptions.AttributeError: 'NoneType' object has no attribute 'lang'

Magnus