Hmmm… I contacted Jay Pfafmann and he suggested - could the issue just be one of low disk space? The forum is running, but has lost all customization:
As the previous message suggests, you’re low on disk space.
But you need to ssh in to your server and do something like this:
cd /var/discourse/
./launcher cleanup
maybe edit containers/app.yml and remove the news plugin here?
./launcher rebuild app