This issue is likely caused by bcrypt 4.1.x removing the about attribute, which passlib still tries to access.

Can you check your bcrypt and passlib versions? Run:

python -c "import bcrypt, passlib; print(bcrypt.__version__, passlib.__version__)"

If bcrypt >= 4.1.0, try downgrading:

pip install "bcrypt==4.0.1"

Let me know what versions you have.