Thanks God, it is finish. My Discourse is ready to dance again.
Even my Discourse now is in 10 USD per month (50 GB).
I fix it with Jammy’s hint above by entering the rails console with:
cd /var/discourse
./launcher enter app
rails c
SiteSetting.selectable_avatars = ""
I use exit
twice to exit from rails console.
Then, rebuild the app as usual.
I got same message when ./launcher enter app
or rails c
. I forget which one.
But, at least, my Discourse is back.
Thank you for your kindness, response, and sharing Ed_s, Jammy, and Richard. May all goodness always comes to you all.
Anyway, I also grateful with Resize and Snapshot VPS feature and I will try to always remember to always open Upgrade page after successful rebuild the app.
Thank you…