exceptions.TypeError: push() takes exactly 2 arguments (7 given)

When running syncdaemon revno 840, I'm getting tons of:

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/twisted/internet/gtk2reactor.py", line 270, in run
    self.__run()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/gtk2reactor.py", line 141, in wrapper
    return real_cb(real_s, condition)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/gtk2reactor.py", line 306, in callback
    self.simulate() # fire Twisted timers
  File "/usr/lib/python2.7/dist-packages/twisted/internet/gtk2reactor.py", line 316, in simulate
    self.runUntilCurrent()
--- <exception caught here> ---
  File "/usr/lib/python2.7/dist-packages/twisted/internet/base.py", line 769, in runUntilCurrent
    f(*a, **kw)
exceptions.TypeError: push() takes exactly 2 arguments (7 given)