Blog not accessible after install another ghost

i installed second ghost on another folder “/var/www/ghost2” and set it up
after that, both ghost is running but both are not able to connect

i think i made mistake when setup second instance
is using same mysql username with ghost1 can ruin both?

currently i tried
‘ghost setup nginx’
remove ghost2
restart ghost1
but still same

how to fix this?
or how to import json data from running ghost without web connection to clean start?

update to new version solved this problem
i still dont know why it happened, and how it solved