cannot import name '_endpoint_from_view_func' from 'flask.helpers'

[swkim101]

python3 main.py --input ../ml/samples/final_model.pkl
Traceback (most recent call last):
  File "main.py", line 10, in <module>
    from app import bp
  File "/home/sungwoo/isadetect/api/app/__init__.py", line 9, in <module>
    from .controller.binary_controller import api as binary
  File "/home/sungwoo/isadetect/api/app/controller/binary_controller.py", line 9, in <module>
    from flask_restplus import Resource
  File "/home/sungwoo/isadetect/api/.venv/lib/python3.8/site-packages/flask_restplus/__init__.py", line 5, in <module>
    from .api import Api  # noqa
  File "/home/sungwoo/isadetect/api/.venv/lib/python3.8/site-packages/flask_restplus/api.py", line 19, in <module>
    from flask.helpers import _endpoint_from_view_func
ImportError: cannot import name '_endpoint_from_view_func' from 'flask.helpers' (/home/sungwoo/isadetect/api/.venv/lib/python3.8/site-packages/flask/helpers.py)