An error "cannot import name 'soft_unicode' from 'markupsafe'"pops up when launch Flask project.

[linette-zyy]

Environment

Steps to Reproduce

1. Create a new Flask Web Project
2. And click "Create virtual environment" from the notification message
   
3. When after installing the environment successfully, press F5 to launch the project
4. Observes

Expected behavior
The project launched successfully without any error.

Additional context and screenshots
An error pops up.

Output

cannot import name 'soft_unicode' from 'markupsafe' (C:\Users\vyizh12\source\repos\FlaskWebProject5\FlaskWebProject5\env\lib\site-packages\markupsafe\__init__.py)
Stack trace:
 >  File "C:\Users\vyizh12\source\repos\FlaskWebProject5\FlaskWebProject5\FlaskWebProject5\__init__.py", line 5, in <module> (Current frame)
 >    from flask import Flask
 >  File "C:\Users\vyizh12\source\repos\FlaskWebProject5\FlaskWebProject5\runserver.py", line 6, in <module>
 >    from FlaskWebProject5 import app
Loaded 'jinja2.filters'
Loaded 'jinja2.defaults'
Loaded 'jinja2.environment'
Loaded 'jinja2'
Loaded 'flask'
Loaded 'FlaskWebProject5'
Loaded '__main__'
Loaded 'runpy'
The program 'python.exe' has exited with code 0 (0x0).

[stefanweiser]

I have exactly the same problem with conan, which also uses jinja2! Seems, that there is an error in the official pip mirror.

[janikarki]

pallets/markupsafe#284