Pro Sites subdomain not working

Hi,

I have setup Pro sites in my site.

However when i add new website (subdomain) such as ramzan.baguslah.com,
the website has error (see attachment).

My hosting spec is:
Hosted at digitalocean.com
OS: Ubuntu
Control Panel : VestaCP

Is it because i use VestaCP, so I have this kind of problem?
If yes, how should i configure the nginx virtual hosts?

Thanks