Error: While importing 'app', an ImportError was raised:

[mwolfaardt]

I've just installed and I get the following errors :
Checking for script in /app/prestart.sh
Running script /app/prestart.sh
Run flask migration upgrades (show current version first)
Usage: flask db current [OPTIONS]
Try 'flask db current --help' for help.
Error: While importing 'app', an ImportError was raised:
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/flask/cli.py", line 218, in locate_app
import(module_name)
File "/app/app.py", line 6, in
from flask_login import LoginManager
File "/usr/local/lib/python3.8/site-packages/flask_login/init.py", line 16, in
from .login_manager import LoginManager
File "/usr/local/lib/python3.8/site-packages/flask_login/login_manager.py", line 24, in
from .utils import (login_url as make_login_url, _create_identifier,
File "/usr/local/lib/python3.8/site-packages/flask_login/utils.py", line 13, in
from werkzeug.security import safe_str_cmp
ImportError: cannot import name 'safe_str_cmp' from 'werkzeug.security' (/usr/local/lib/python3.8/site-packages/werkzeug/security.py)
Checking for script in /app/prestart.sh
Running script /app/prestart.sh
Run flask migration upgrades (show current version first)
Usage: flask db current [OPTIONS]
Try 'flask db current --help' for help.
Error: While importing 'app', an ImportError was raised:
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/flask/cli.py", line 218, in locate_app
import(module_name)
File "/app/app.py", line 6, in
from flask_login import LoginManager
File "/usr/local/lib/python3.8/site-packages/flask_login/init.py", line 16, in
from .login_manager import LoginManager
File "/usr/local/lib/python3.8/site-packages/flask_login/login_manager.py", line 24, in
from .utils import (login_url as make_login_url, _create_identifier,
File "/usr/local/lib/python3.8/site-packages/flask_login/utils.py", line 13, in
from werkzeug.security import safe_str_cmp
ImportError: cannot import name 'safe_str_cmp' from 'werkzeug.security' (/usr/local/lib/python3.8/site-packages/werkzeug/security.py)

[Nindouja]

I have the same problem

ImportError: cannot import name 'safe_str_cmp' from 'werkzeug.security' (/usr/local/lib/python3.8/site-packages/werkzeug/security.py)
Checking for script in /app/prestart.sh
Running script /app/prestart.sh
Run flask migration upgrades (show current version first)
Usage: flask db current [OPTIONS]
Try 'flask db current --help' for help.
Error: While importing 'app', an ImportError was raised:
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/flask/cli.py", line 218, in locate_app
    __import__(module_name)
  File "/app/app.py", line 6, in <module>
    from flask_login import LoginManager
  File "/usr/local/lib/python3.8/site-packages/flask_login/__init__.py", line 16, in <module>
    from .login_manager import LoginManager
  File "/usr/local/lib/python3.8/site-packages/flask_login/login_manager.py", line 24, in <module>
    from .utils import (login_url as make_login_url, _create_identifier,
  File "/usr/local/lib/python3.8/site-packages/flask_login/utils.py", line 13, in <module>
    from werkzeug.security import safe_str_cmp

Probably a duplicate of #19
There seems to be a fix but it has not been merged since 5 months :/