bridgedb traceback: Database instance has no attribute 'cleanWarnedBridges'

Unhandled error in Deferred:
Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/twisted/internet/base.py", line 1165, in run
    self.mainLoop()
  File "/usr/lib/python2.6/dist-packages/twisted/internet/base.py", line 1174, in mainLoop
    self.runUntilCurrent()
  File "/usr/lib/python2.6/dist-packages/twisted/internet/base.py", line 796, in runUntilCurrent
    call.func(*call.args, **call.kw)
  File "/usr/lib/python2.6/dist-packages/twisted/internet/task.py", line 194, in __call__
    d = defer.maybeDeferred(self.f, *self.a, **self.kw)
--- <exception caught here> ---
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 125, in maybeDeferred
    result = f(*args, **kw)
  File "/home/bridges/lib/python2.6/site-packages/bridgedb/Dist.py", line 299, in cleanDatabase
    db.cleanWarnedBridges(time.time()-MAX_EMAIL_RATE)
exceptions.AttributeError: Database instance has no attribute 'cleanWarnedBridges'