I occasionally get the following error (or similar) dealing with defer.py and deferral.py:

[rfyiamcool]

I occasionally get the following error (or similar) dealing with defer.py and deferral.py:

2014-06-27 19:44:17.483326 > Unhandled Error
2014-06-27 19:44:17.483571 > Traceback (most recent call last):
2014-06-27 19:44:17.483753 > File "/usr/local/Cellar/pypy/2.3.1/libexec/site-packages/Twisted-13.1.0-py2.7-macosx-10.8-intel.egg/twisted/internet/defer.py", line 488, in _startRunCallbacks
2014-06-27 19:44:17.483870 > self._runCallbacks()
2014-06-27 19:44:17.484088 > File "/usr/local/Cellar/pypy/2.3.1/libexec/site-packages/Twisted-13.1.0-py2.7-macosx-10.8-intel.egg/twisted/internet/defer.py", line 575, in _runCallbacks
2014-06-27 19:44:17.484197 > current.result = callback(current.result, _args, *_kw)
2014-06-27 19:44:17.484303 > File "/Users/jedimstr/p2pool/p2pool/util/deferral.py", line 256, in gotResult
2014-06-27 19:44:17.484417 > it(res2)
2014-06-27 19:44:17.484522 > File "/Users/jedimstr/p2pool/p2pool/util/deferral.py", line 233, in it
2014-06-27 19:44:17.484633 > res = gen.send(cur) # external code is run here
2014-06-27 19:44:17.484740 > --- ---
2014-06-27 19:44:17.484850 > File "/Users/jedimstr/p2pool/p2pool/util/deferral.py", line 284, in _worker
2014-06-27 19:44:17.484963 > self.func(_self.args, *_self.kwargs)
2014-06-27 19:44:17.485069 > File "/Users/jedimstr/p2pool/p2pool/util/expiring_dict.py", line 109, in
2014-06-27 19:44:17.485176 > self._expire_loop = expire_loop = deferral.RobustLoopingCall(lambda: self_ref().expire())
2014-06-27 19:44:17.485398 > exceptions.AttributeError: 'NoneType' object has no attribute 'expire'
2014-06-27 19:44:17.488420 > Unhandled Error
2014-06-27 19:44:17.490643 > Traceback (most recent call last):
2014-06-27 19:44:17.490859 > File "/usr/local/Cellar/pypy/2.3.1/libexec/site-packages/Twisted-13.1.0-py2.7-macosx-10.8-intel.egg/twisted/internet/defer.py", line 488, in _startRunCallbacks
2014-06-27 19:44:17.490974 > self._runCallbacks()
2014-06-27 19:44:17.491095 > File "/usr/local/Cellar/pypy/2.3.1/libexec/site-packages/Twisted-13.1.0-py2.7-macosx-10.8-intel.egg/twisted/internet/defer.py", line 575, in _runCallbacks
2014-06-27 19:44:17.491219 > current.result = callback(current.result, _args, *_kw)
2014-06-27 19:44:17.491334 > File "/Users/jedimstr/p2pool/p2pool/util/deferral.py", line 256, in gotResult
2014-06-27 19:44:17.491450 > it(res2)
2014-06-27 19:44:17.491567 > File "/Users/jedimstr/p2pool/p2pool/util/deferral.py", line 233, in it
2014-06-27 19:44:17.491770 > res = gen.send(cur) # external code is run here
2014-06-27 19:44:17.491875 > --- ---
2014-06-27 19:44:17.491979 > File "/Users/jedimstr/p2pool/p2pool/util/deferral.py", line 284, in _worker
2014-06-27 19:44:17.492085 > self.func(_self.args, *_self.kwargs)
2014-06-27 19:44:17.492191 > File "/Users/jedimstr/p2pool/p2pool/util/expiring_dict.py", line 109, in
2014-06-27 19:44:17.492305 > self._expire_loop = expire_loop = deferral.RobustLoopingCall(lambda: self_ref().expire())
2014-06-27 19:44:17.492415 > exceptions.AttributeError: 'NoneType' object has no attribute 'expire'
Sometimes it appears and just chugs along, but other times (like when bitcoin core is restarted), it continuously gives me these errors until I restart p2pool.

This is run on a MacPro running Mavericks and pypy instead of regular python (but I get this error under normal python as well).

[ilsawa]

I'm getting the same error with pypy on ubuntu linux:

Unhandled Error
Traceback (most recent call last):
  File "/usr/local/lib/pypy2.7/dist-packages/twisted/internet/defer.py", line 501, in _startRunCallbacks
    self._runCallbacks()
  File "/usr/local/lib/pypy2.7/dist-packages/twisted/internet/defer.py", line 588, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/opt/sha256d/p2pool-btc/p2pool/util/deferral.py", line 256, in gotResult
    it(res2)
  File "/opt/sha256d/p2pool-btc/p2pool/util/deferral.py", line 233, in it
    res = gen.send(cur) # external code is run here
--- <exception caught here> ---
  File "/opt/sha256d/p2pool-btc/p2pool/util/deferral.py", line 284, in _worker
    self.func(*self.args, **self.kwargs)
  File "/opt/sha256d/p2pool-btc/p2pool/util/expiring_dict.py", line 109, in <lambda>
    self._expire_loop = expire_loop = deferral.RobustLoopingCall(lambda: self_ref().expire())
exceptions.AttributeError: 'NoneType' object has no attribute 'expire'