blank screen after creating account

[ranjit-git]

i Tried to install first time.
i configured pgsql credential in browser and then i prompted to create my administrator account like attached image .
But when i put admin user and password to create account and hit enter then its gives me white blank screen.
now itried sudo php src/Installer/launch.php reset command and started setup but got same result everytime. Everytime it gives white blank screen when i hit enter and even if i click "continue with advanced install"
How to fix it?

[ranjit-git]