init("sim") in IPython notebook crashes after a few seconds

Unhandled Exception: ZeroMQ.ZmqSocketException: No such file or directory
  at ZeroMQ.ZmqSocket.Receive (System.Byte[] buffer, SocketFlags flags, System.Int32& size) [0x00000] in <filename unknown>:0 
  at ZeroMQ.ZmqSocket.Receive (System.Byte[] buffer, System.Int32& size) [0x00000] in <filename unknown>:0 
  at ZeroMQ.ZmqSocket.Receive (System.Byte[] buffer, TimeSpan timeout, System.Int32& size) [0x00000] in <filename unknown>:0 
  at ZeroMQ.SendReceiveExtensions.Receive (ZeroMQ.ZmqSocket socket, System.Text.Encoding encoding, TimeSpan timeout) [0x00000] in <filename unknown>:0 
  at ZeroMQ.SendReceiveExtensions.Receive (ZeroMQ.ZmqSocket socket, System.Text.Encoding encoding) [0x00000] in <filename unknown>:0 
  at ZMQServer+Channel.loop () [0x00000] in <filename unknown>:0 
  at System.Threading.Thread.StartInternal () [0x00000] in <filename unknown>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: ZeroMQ.ZmqSocketException: No such file or directory
  at ZeroMQ.ZmqSocket.Receive (System.Byte[] buffer, SocketFlags flags, System.Int32& size) [0x00000] in <filename unknown>:0 
  at ZeroMQ.ZmqSocket.Receive (System.Byte[] buffer, System.Int32& size) [0x00000] in <filename unknown>:0 
  at ZeroMQ.ZmqSocket.Receive (System.Byte[] buffer, TimeSpan timeout, System.Int32& size) [0x00000] in <filename unknown>:0 
  at ZeroMQ.SendReceiveExtensions.Receive (ZeroMQ.ZmqSocket socket, System.Text.Encoding encoding, TimeSpan timeout) [0x00000] in <filename unknown>:0 
  at ZeroMQ.SendReceiveExtensions.Receive (ZeroMQ.ZmqSocket socket, System.Text.Encoding encoding) [0x00000] in <filename unknown>:0 
  at ZMQServer+Channel.loop () [0x00000] in <filename unknown>:0 
  at System.Threading.Thread.StartInternal () [0x00000] in <filename unknown>:0
Not sure why... other things appear to be working fine...
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