Traceback (most recent call last):
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/traitlets/traitlets.py", line 528, in get
    value = obj._trait_values[self.name]
KeyError: 'loop'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/tornado/web.py", line 1592, in _execute
    result = yield result
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/tornado/gen.py", line 1133, in run
    value = future.result()
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/tornado/gen.py", line 1141, in run
    yielded = self.gen.throw(*exc_info)
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/notebook/services/sessions/handlers.py", line 73, in post
    type=mtype))
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/tornado/gen.py", line 1133, in run
    value = future.result()
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/tornado/gen.py", line 1141, in run
    yielded = self.gen.throw(*exc_info)
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/notebook/services/sessions/sessionmanager.py", line 79, in create_session
    kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/tornado/gen.py", line 1133, in run
    value = future.result()
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/tornado/gen.py", line 1141, in run
    yielded = self.gen.throw(*exc_info)
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/notebook/services/sessions/sessionmanager.py", line 92, in start_kernel_for_session
    self.kernel_manager.start_kernel(path=kernel_path, kernel_name=kernel_name)
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/tornado/gen.py", line 1133, in run
    value = future.result()
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/tornado/gen.py", line 326, in wrapper
    yielded = next(result)
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/notebook/services/kernels/kernelmanager.py", line 160, in start_kernel
    super(MappingKernelManager, self).start_kernel(**kwargs)
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/jupyter_client/multikernelmanager.py", line 110, in start_kernel
    km.start_kernel(**kwargs)
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/jupyter_client/manager.py", line 258, in start_kernel
    self.start_restarter()
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/jupyter_client/ioloop/manager.py", line 49, in start_restarter
    kernel_manager=self, loop=self.loop,
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/traitlets/traitlets.py", line 556, in __get__
    return self.get(obj, cls)
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/traitlets/traitlets.py", line 535, in get
    value = self._validate(obj, dynamic_default())
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/traitlets/traitlets.py", line 591, in _validate
    value = self.validate(obj, value)
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/traitlets/traitlets.py", line 1677, in validate
    self.error(obj, value)
  File "/opt/h2oai/h2o4gpu/python/lib/python3.6/site-packages/traitlets/traitlets.py", line 1524, in error
    raise TraitError(e)
traitlets.traitlets.TraitError: The 'loop' trait of an IOLoopKernelManager instance must be a ZMQIOLoop, but a value of class 'tornado.platform.asyncio.AsyncIOMainLoop' (i.e. <tornado.platform.asyncio.AsyncIOMainLoop object at 0x7ff535b32f98>) was specified.