can not run this code on the latest version

[Xuminhua]

I'd like to run this code. However, after pip install -r requirements.txt and try to run on my mac laptop. I got some error message like below:
@app.before_first_request AttributeError: 'Flask' object has no attribute 'before_first_request'. Did you mean: '_got_first_request'?

Due to package version. Would you help add the version number in the requirement.txt which could run the code? Thank you.