Discourse Forum is Down. Strange Error Message

[sutterseba]

See this:

Forum doesn't work after latest upgrade

I’ve just pressed button to update the Discourse engine and got 500 error now: The software powering this discussion forum encountered an unexpected problem. We apologize for the inconvenience. The safe mode also doesn’t work. This is the forum URL — https://forum.dudin.tv How to restore the forum? Which logs I should check out?

TL;DR: Do a container rebuild with ./launcher rebuild app in your installation folder.