AttributeError: 'NoneType' object has no attribute 'modified'

[Relebohile3369]

Hi,

I need help, I'm encountering this error below when I run my app on localhost:5000. Can you please help me to fix this error?

"
File "/Users/lesmacbookpro/Desktop/Xero/THE RIGHT ONE/xero-python-oauth2-starter-master/venv/lib/python3.11/site-packages/flask_session/sessions.py", line 343, in save_session
if session.modified:
^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'modified'
127.0.0.1 - - [19/Aug/2023 18:12:19] "GET / HTTP/1.1" 500 -"

[SherryFeng123]

What worked for me was installing an older version of flask. The version I did was flask==2.2.5