An example on 2.7.13:

Traceback (most recent call last):
  File "/opt/python/2.7.9/lib/python2.7/multiprocessing/process.py", line 258, in _bootstrap
    self.run()
  File "/opt/python/2.7.9/lib/python2.7/multiprocessing/process.py", line 114, in run
    self._target(*self._args, **self._kwargs)
  File "/home/travis/build/drallensmith/neat-python/tests/test_distributed.py", line 412, in run_secondary
    de.start(secondary_wait=3, exit_on_stop=True)
  File "/home/travis/build/drallensmith/neat-python/neat/distributed.py", line 414, in start
    self._secondary_loop(reconnect_max_time=reconnect_max_time)
  File "/home/travis/build/drallensmith/neat-python/neat/distributed.py", line 616, in _secondary_loop
    self.outqueue.put(res)
  File "<string>", line 2, in put
  File "/opt/python/2.7.9/lib/python2.7/multiprocessing/managers.py", line 774, in _callmethod
    raise convert_to_error(kind, result)
AssertionError
Process Child evaluation process (multiple workers):
Traceback (most recent call last):
  File "/opt/python/2.7.9/lib/python2.7/multiprocessing/process.py", line 258, in _bootstrap
    self.run()
  File "/opt/python/2.7.9/lib/python2.7/multiprocessing/process.py", line 114, in run
    self._target(*self._args, **self._kwargs)
  File "/home/travis/build/drallensmith/neat-python/tests/test_distributed.py", line 412, in run_secondary
    de.start(secondary_wait=3, exit_on_stop=True)
  File "/home/travis/build/drallensmith/neat-python/neat/distributed.py", line 414, in start
    self._secondary_loop(reconnect_max_time=reconnect_max_time)
  File "/home/travis/build/drallensmith/neat-python/neat/distributed.py", line 616, in _secondary_loop
    self.outqueue.put(res)
  File "<string>", line 2, in put
  File "/opt/python/2.7.9/lib/python2.7/multiprocessing/managers.py", line 774, in _callmethod
    raise convert_to_error(kind, result)
AssertionError