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Flask guide not working?

Guys,I've got a problem over here about the beginner's guide for Flask(here).

At the end of the guide,there's something not working well and the website returned an error. After an entire hour trying to find the typo,I gave up and replaced the code and the HTML template with the ones provided in the blog. But it still didn't work:see this

The guide is on the blog (maybe) since pythonanywhere existed,but having errors like this?

I can't see your site, because you set a password on it. The best way to start debugging a non working web app is to look at the error log (you'll find links to the logs on the Web page).