Jupyther kernel not starting from tvb Dockerfiles

RuntimeError: This event loop is already running

  File "/opt/conda/envs/tvb-run/lib/python3.7/site-packages/tornado/gen.py", line 234, in wrapper
    yielded = ctx_run(next, result)
  File "/opt/conda/envs/tvb-run/lib/python3.7/site-packages/notebook/services/sessions/sessionmanager.py", line 98, in create_session
    kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)
  File "/opt/conda/envs/tvb-run/lib/python3.7/site-packages/tornado/gen.py", line 250, in wrapper
    runner = Runner(ctx_run, result, future, yielded)
  File "/opt/conda/envs/tvb-run/lib/python3.7/site-packages/tornado/gen.py", line 739, in __init__
    if self.handle_yield(first_yielded):
  File "/opt/conda/envs/tvb-run/lib/python3.7/site-packages/tornado/gen.py", line 816, in handle_yield
    self.io_loop.add_future(self.future, inner)
  File "/opt/conda/envs/tvb-run/lib/python3.7/site-packages/tornado/ioloop.py", line 691, in add_future
    assert is_future(future)
AssertionError