ZMQError: Invalid argument

Exception in thread Thread-3:
Traceback (most recent call last):
  File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "main.py", line 154, in log_loop
    sub = zmq_tools.Msg_Receiver(zmq_ctx,ipc_sub_url,topics=("logging",))
  File "/home/ubuntu/pupil/pupil_src/shared_modules/zmq_tools.py", line 77, in __init__
    self.subscribe(t)
  File "/home/ubuntu/pupil/pupil_src/shared_modules/zmq_tools.py", line 80, in subscribe
    self.socket.subscribe(topic)
  File "/usr/lib/python3/dist-packages/zmq/sugar/attrsettr.py", line 45, in __getattr__
    return self._get_attr_opt(upper_key, opt)
  File "/usr/lib/python3/dist-packages/zmq/sugar/attrsettr.py", line 49, in _get_attr_opt
    return self.get(opt)
  File "zmq/backend/cython/socket.pyx", line 423, in zmq.backend.cython.socket.Socket.get (zmq/backend/cython/socket.c:4559)
  File "zmq/backend/cython/socket.pyx", line 215, in zmq.backend.cython.socket._getsockopt (zmq/backend/cython/socket.c:2684)
  File "zmq/backend/cython/checkrc.pxd", line 25, in zmq.backend.cython.checkrc._check_rc (zmq/backend/cython/socket.c:7535)
zmq.error.ZMQError: Invalid argument

Exception in thread Thread-4:
Traceback (most recent call last):
  File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "main.py", line 114, in delay_proxy
    sub = zmq_tools.Msg_Receiver(ctx,ipc_sub_url,('delayed_notify',))
  File "/home/ubuntu/pupil/pupil_src/shared_modules/zmq_tools.py", line 77, in __init__
    self.subscribe(t)
  File "/home/ubuntu/pupil/pupil_src/shared_modules/zmq_tools.py", line 80, in subscribe
    self.socket.subscribe(topic)
  File "/usr/lib/python3/dist-packages/zmq/sugar/attrsettr.py", line 45, in __getattr__
    return self._get_attr_opt(upper_key, opt)
  File "/usr/lib/python3/dist-packages/zmq/sugar/attrsettr.py", line 49, in _get_attr_opt
    return self.get(opt)
  File "zmq/backend/cython/socket.pyx", line 423, in zmq.backend.cython.socket.Socket.get (zmq/backend/cython/socket.c:4559)
  File "zmq/backend/cython/socket.pyx", line 215, in zmq.backend.cython.socket._getsockopt (zmq/backend/cython/socket.c:2684)
  File "zmq/backend/cython/checkrc.pxd", line 25, in zmq.backend.cython.checkrc._check_rc (zmq/backend/cython/socket.c:7535)
zmq.error.ZMQError: Invalid argument

Traceback (most recent call last):
  File "main.py", line 321, in <module>
    launcher()
  File "main.py", line 218, in launcher
    cmd_sub = zmq_tools.Msg_Receiver(zmq_ctx, ipc_sub_url, topics=topics)
  File "/home/ubuntu/pupil/pupil_src/shared_modules/zmq_tools.py", line 77, in __init__
    self.subscribe(t)
  File "/home/ubuntu/pupil/pupil_src/shared_modules/zmq_tools.py", line 80, in subscribe
    self.socket.subscribe(topic)
  File "/usr/lib/python3/dist-packages/zmq/sugar/attrsettr.py", line 45, in __getattr__
    return self._get_attr_opt(upper_key, opt)
  File "/usr/lib/python3/dist-packages/zmq/sugar/attrsettr.py", line 49, in _get_attr_opt
    return self.get(opt)
  File "zmq/backend/cython/socket.pyx", line 423, in zmq.backend.cython.socket.Socket.get (zmq/backend/cython/socket.c:4559)
  File "zmq/backend/cython/socket.pyx", line 215, in zmq.backend.cython.socket._getsockopt (zmq/backend/cython/socket.c:2684)
  File "zmq/backend/cython/checkrc.pxd", line 25, in zmq.backend.cython.checkrc._check_rc (zmq/backend/cython/socket.c:7535)
zmq.error.ZMQError: Invalid argument