Apache-Airflowのインストール中にエラーが発生する[終了]

airflow -versionとairflow initdbを試すとエラーが発生します

  File "/home/ravi/sandbox/bin/airflow", line 26, in <module>
    from airflow.bin.cli import CLIFactory
  File "/home/ravi/sandbox/lib/python3.6/site-packages/airflow/bin/cli.py", line 70, in <module>
    from airflow.www.app import (cached_app, create_app)
  File "/home/ravi/sandbox/lib/python3.6/site-packages/airflow/www/app.py", line 37, in <module>
    from airflow.www.blueprints import routes
  File "/home/ravi/sandbox/lib/python3.6/site-packages/airflow/www/blueprints.py", line 25, in <module>
    from airflow.www import utils as wwwutils
  File "/home/ravi/sandbox/lib/python3.6/site-packages/airflow/www/utils.py", line 39, in <module>
    from flask_admin.model import filters
  File "/home/ravi/sandbox/lib/python3.6/site-packages/flask_admin/model/__init__.py", line 2, in <module>
    from .base import BaseModelView
  File "/home/ravi/sandbox/lib/python3.6/site-packages/flask_admin/model/base.py", line 8, in <module>
    from werkzeug import secure_filename
ImportError: cannot import name 'secure_filename' ```

（pip install werkzeug == 0.16.0）それはうまくいきました：

DB：sqlite：////home/centos/airflow/airflow.db

[2020-02-07 12：02：02,523] {db.py:368} INFO-テーブルを作成しています