Error upgrading, failed to bootstrap

I apologize, I am new to using Linux servers and commands. The app was not running, so I do:

./launcher start app
x86_64 arch detected.                                                                                           starting up existing container                          
+ /usr/bin/docker start app
app

After that:

./launcher enter app

And then, following your indications, first error:

sudo postgres            
sudo: postgres: command not found

If I type psql:

psql: error: FATAL: database "root" does not exist