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Error code: 502-backend

Hi to whom it may concern, I am trying to deploy a virtual escape room app that contains a series of puzzles on your server. Everything runs smoothly for the first several puzzles but at one of them I constantly get the following error after submitting the correct answer.

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Error code: 502-backend

There is nothing in the error log. And when I check the access log I found this "POST /puzzle/768227f5-7096-4512-89e7-212ef83df3a8 HTTP/1.1" 502 1661 "https://sph-utsw-outbreak-investigation-ianyangyuqiu.pythonanywhere.com/puzzle/768227f5-7096-4512-89e7-212ef83df3a8" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:134.0) Gecko/20100101 Firefox/134.0" "129.112.109.42" response-time=0.009

Do you what might be the problem?

Thank you very much.

Are you sure that you are looking at the correct error log? It should be something like https://www.pythonanywhere.com/user/ianyangyuqiu/files/var/log/sph-utsw-outbreak-investigation-ianyangyuqiu.pythonanywhere.com.error.log