Mémoire insuffisante, tuer le processus, sacrifier l'enfant

Hi there, I ran an upgrade on my DigitalOcean droplet for Discourse and have this error, it appears to have hung in the console. Anyone know what I should do? Bounce machine?

Bounce machine and run another rebuild sounds like a good idea. Also be sure to have swap set.

OK bounced server, logged in as root and it shows this when I try to rebuild. Am I doing something wrong?
Capture2

You are missing a cd there … try.

cd /var/discourse
./launcher rebuild app

Aaaaaaaah so obvious now! Thank you @sam!