O erro é o seguinte: Traceback (most recent call last): File “C:/Users/peng/PycharmProjects/fmz_extend_api_demo-master/app.py”, line 22, in from flask_wtf import FlaskForm File “D:\Program Files (x86)\Python\Python38\lib\site-packages\flask_wtfinit.py”, line 17, in from .recaptcha import * File “D:\Program Files (x86)\Python\Python38\lib\site-packages\flask_wtf\recaptchainit.py”, line 2, in from .fields import * File “D:\Program Files (x86)\Python\Python38\lib\site-packages\flask_wtf\recaptcha\fields.py”, line 3, in from . import widgets File “D:\Program Files (x86)\Python\Python38\lib\site-packages\flask_wtf\recaptcha\widgets.py”, line 5, in from werkzeug import url_encode ImportError: cannot import name ‘url_encode’ from ‘werkzeug’ (D:\Program Files (x86)\Python\Python38\lib\site-packages\werkzeuginit.py)

Tentar substituir o Werkzeug com a versão 0.15.2 ou 0.16.0 não é possível.