Import issue: AttributeError: 'NoneType' object has no attribute 'session'

Bắt đầu với các đường dẫn traceback trong ipykernel/comm/comm.py và matplotlib/backends/backend_nbagg.py, sau đó tái hiện cerebro.plot() từ VS Code. So sánh ngữ cảnh thực thi đó với hành vi liên quan đến Jupyter được mô tả trong issue. Done phải có nghĩa là lỗi đã được tái hiện và либо được sửa, hoặc ngữ cảnh thực thi được hỗ trợ đã được ghi lại rõ ràng.

When import the package inside VScode I get an error:

<IPython.core.display.Javascript object>
<IPython.core.display.HTML object>
Traceback (most recent call last):
  File ".\dpseg.py", line 379, in <module>
    run()
  File ".\dpseg.py", line 320, in run
    cerebro.plot()
  File "C:\ProgramData\Anaconda3\lib\site-packages\backtrader\cerebro.py", line 996, in plot
    plotter.show()
  File "C:\ProgramData\Anaconda3\lib\site-packages\backtrader\plot\plot.py", line 817, in show
    self.mpyplot.show()
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\matplotlib\pyplot.py", line 272, in show
    return _show(*args, **kw)
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\matplotlib\backends\backend_nbagg.py", line 261, in show
    manager.show()
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\matplotlib\backends\backend_nbagg.py", line 90, in show
    self._create_comm()
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\matplotlib\backends\backend_nbagg.py", line 122, in _create_comm
    self.add_web_socket(comm)
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\matplotlib\backends\backend_webagg_core.py", line 433, in add_web_socket
    self.resize(w, h)
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\matplotlib\backends\backend_webagg_core.py", line 417, in resize
    self._send_event(
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\matplotlib\backends\backend_webagg_core.py", line 490, in _send_event
    s.send_json(payload)
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\matplotlib\backends\backend_nbagg.py", line 199, in send_json
    self.comm.send({'data': json.dumps(content)})
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\ipykernel\comm\comm.py", line 122, in send
    self._publish_msg('comm_msg',
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\ipykernel\comm\comm.py", line 66, in _publish_msg
    self.kernel.session.send(self.kernel.iopub_socket, msg_type,
AttributeError: 'NoneType' object has no attribute 'session'
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\matplotlib\_pylab_helpers.py", line 72, in destroy_all
    manager.destroy()
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\matplotlib\backends\backend_nbagg.py", line 126, in destroy
    self._send_event('close')
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\matplotlib\backends\backend_webagg_core.py", line 490, in _send_event
    s.send_json(payload)
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\matplotlib\backends\backend_nbagg.py", line 199, in send_json
    self.comm.send({'data': json.dumps(content)})
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\ipykernel\comm\comm.py", line 122, in send
    self._publish_msg('comm_msg',
  File "C:\Users\Mislav\AppData\Roaming\Python\Python38\site-packages\ipykernel\comm\comm.py", line 66, in _publish_msg
    self.kernel.session.send(self.kernel.iopub_socket, msg_type,
AttributeError: 'NoneType' object has no attribute 'session'

I have found similar issue few years old, but I don't understand what is the solution to this. It is mentioning jupyter notebook. Do I have to use this package only inside jupyter?