File "/usr/local/lib/python3.5/dist-packages/electrum/util.py", line 794, in run_with_except_hook
    run_original(*args2, **kwargs2)
  File "/usr/local/lib/python3.5/dist-packages/electrum/network.py", line 985, in run
    self.wait_on_sockets()
  File "/usr/local/lib/python3.5/dist-packages/electrum/network.py", line 967, in wait_on_sockets
    self.process_responses(interface)
  File "/usr/local/lib/python3.5/dist-packages/electrum/network.py", line 626, in process_responses
    self.process_response(interface, response, callbacks)
  File "/usr/local/lib/python3.5/dist-packages/electrum/network.py", line 572, in process_response
    self.on_get_header(interface, response)
  File "/usr/local/lib/python3.5/dist-packages/electrum/network.py", line 926, in on_get_header
    raise Exception(interface.mode)