All of my apps stopped working after the system image change. Therefore I changed the system image to glastonbury and set Python 3.6 to use everywhere and also set it for an app with .hu domain extension to test. I have refreshed the web app and I still get the 502 backend error. I can't see any information in the error log regarding to this, so I would like to ask you what can be the problem? Of course I have read the how to page, but unfortunately I couldn't figure out a fix. What am I missing? Is there a way to find the exact reason of the issue?