Cannot ./launcher rebuild app

Product Support Self-hosting
4

It gives this :

root@forum:/var/discourse# free -h
              total        used        free      shared  buff/cache   available
Mem:          7.8Gi       1.7Gi       2.8Gi       1.0Gi       3.2Gi       4.8Gi
Swap:            0B          0B          0B
root@forum:/var/discourse#