ERROR:tornado.general:Uncaught exception in ZMQStream callback
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/zmq/eventloop/zmqstream.py", line 432, in _run_callback
    callback(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/tornado/stack_context.py", line 300, in null_wrapper
    return fn(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/ipykernel/kernelbase.py", line 283, in dispatcher
    return self.dispatch_shell(stream, msg)
  File "/usr/lib/python3.7/site-packages/ipykernel/kernelbase.py", line 233, in dispatch_shell
    self.pre_handler_hook()
  File "/usr/lib/python3.7/site-packages/ipykernel/kernelbase.py", line 248, in pre_handler_hook
    self.saved_sigint_handler = signal(SIGINT, default_int_handler)
  File "/usr/lib/python3.7/signal.py", line 47, in signal
    handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
ValueError: signal only works in main thread
ERROR:tornado.general:Uncaught exception in zmqstream callback
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/zmq/eventloop/zmqstream.py", line 450, in _handle_events
    self._handle_recv()
  File "/usr/lib/python3.7/site-packages/zmq/eventloop/zmqstream.py", line 480, in _handle_recv
    self._run_callback(callback, msg)
  File "/usr/lib/python3.7/site-packages/zmq/eventloop/zmqstream.py", line 432, in _run_callback
    callback(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/tornado/stack_context.py", line 300, in null_wrapper
    return fn(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/ipykernel/kernelbase.py", line 283, in dispatcher
    return self.dispatch_shell(stream, msg)
  File "/usr/lib/python3.7/site-packages/ipykernel/kernelbase.py", line 233, in dispatch_shell
    self.pre_handler_hook()
  File "/usr/lib/python3.7/site-packages/ipykernel/kernelbase.py", line 248, in pre_handler_hook
    self.saved_sigint_handler = signal(SIGINT, default_int_handler)
  File "/usr/lib/python3.7/signal.py", line 47, in signal
    handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
ValueError: signal only works in main thread
Traceback (most recent call last):
  File "/usr/lib/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/usr/lib/python3.7/site-packages/ipykernel_launcher.py", line 16, in <module>
    app.launch_new_instance()
  File "/usr/lib/python3.7/site-packages/traitlets/config/application.py", line 658, in launch_instance
    app.start()
  File "/usr/lib/python3.7/site-packages/ipykernel/kernelapp.py", line 477, in start
    ioloop.IOLoop.instance().start()
  File "/usr/lib/python3.7/site-packages/tornado/platform/asyncio.py", line 132, in start
    self.asyncio_loop.run_forever()
  File "/usr/lib/python3.7/asyncio/base_events.py", line 510, in run_forever
    raise RuntimeError('This event loop is already running')
RuntimeError: This event loop is already running
ERROR:tornado.application:Exception in callback functools.partial(<function wrap.<locals>.null_wrapper at 0x7f27d85e2d90>)
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/tornado/ioloop.py", line 758, in _run_callback
    ret = callback()
  File "/usr/lib/python3.7/site-packages/tornado/stack_context.py", line 300, in null_wrapper
    return fn(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/zmq/eventloop/zmqstream.py", line 536, in <lambda>
    self.io_loop.add_callback(lambda : self._handle_events(self.socket, 0))
  File "/usr/lib/python3.7/site-packages/zmq/eventloop/zmqstream.py", line 450, in _handle_events
    self._handle_recv()
  File "/usr/lib/python3.7/site-packages/zmq/eventloop/zmqstream.py", line 480, in _handle_recv
    self._run_callback(callback, msg)
  File "/usr/lib/python3.7/site-packages/zmq/eventloop/zmqstream.py", line 432, in _run_callback
    callback(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/tornado/stack_context.py", line 300, in null_wrapper
    return fn(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/ipykernel/kernelbase.py", line 283, in dispatcher
    return self.dispatch_shell(stream, msg)
  File "/usr/lib/python3.7/site-packages/ipykernel/kernelbase.py", line 233, in dispatch_shell
    self.pre_handler_hook()
  File "/usr/lib/python3.7/site-packages/ipykernel/kernelbase.py", line 248, in pre_handler_hook
    self.saved_sigint_handler = signal(SIGINT, default_int_handler)
  File "/usr/lib/python3.7/signal.py", line 47, in signal
    handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
ValueError: signal only works in main thread
Traceback (most recent call last):
  File "/usr/bin/jupyter-console", line 5, in <module>
    app.main()
  File "/usr/lib/python3.7/site-packages/jupyter_core/application.py", line 266, in launch_instance
    return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
  File "/usr/lib/python3.7/site-packages/traitlets/config/application.py", line 657, in launch_instance
    app.initialize(argv)
  File "<decorator-gen-116>", line 2, in initialize
  File "/usr/lib/python3.7/site-packages/traitlets/config/application.py", line 87, in catch_config_error
    return method(app, *args, **kwargs)
  File "/usr/lib/python3.7/site-packages/jupyter_console/app.py", line 141, in initialize
    self.init_shell()
  File "/usr/lib/python3.7/site-packages/jupyter_console/app.py", line 114, in init_shell
    client=self.kernel_client,
  File "/usr/lib/python3.7/site-packages/traitlets/config/configurable.py", line 412, in instance
    inst = cls(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/jupyter_console/ptshell.py", line 272, in __init__
    self.init_kernel_info()
  File "/usr/lib/python3.7/site-packages/jupyter_console/ptshell.py", line 323, in init_kernel_info
    reply = self.client.get_shell_msg(timeout=1)
  File "/usr/lib/python3.7/site-packages/jupyter_client/client.py", line 77, in get_shell_msg
    return self.shell_channel.get_msg(*args, **kwargs)
  File "/usr/lib/python3.7/site-packages/jupyter_client/blocking/channels.py", line 50, in get_msg
    ready = self.socket.poll(timeout)
  File "/usr/lib/python3.7/site-packages/zmq/sugar/socket.py", line 694, in poll
    evts = dict(p.poll(timeout))
  File "/usr/lib/python3.7/site-packages/zmq/sugar/poll.py", line 99, in poll
    return zmq_poll(self.sockets, timeout=timeout)
  File "zmq/backend/cython/_poll.pyx", line 143, in zmq.backend.cython._poll.zmq_poll
  File "zmq/backend/cython/_poll.pyx", line 123, in zmq.backend.cython._poll.zmq_poll
  File "zmq/backend/cython/checkrc.pxd", line 12, in zmq.backend.cython.checkrc._check_rc
  File "/usr/lib/python3.7/site-packages/jupyter_console/app.py", line 123, in handle_sigint
    if self.shell._executing:
AttributeError: 'ZMQTerminalIPythonApp' object has no attribute 'shell'