Roundcube Webmail 500 Internal Server Error

Am trying login in mine webmail via Roundcube getting this error

This page isn’t working

www.test.in is currently unable to handle this request.

HTTP ERROR 500

Are you able to access the admin page?

What does the Nginx error log say?

No sir i dont have admin page
What does it mean “Nginx error log say?”
and where should i get this

@Rahul

First attempt to load roundcube in your browser.

Then, In the terminal type

sudo tail -20 /var/log/nginx/error.log

paste the output here or PM it.

If there is no output then type this instead, and paste the output here.

sudo tail -20 /var/log/nginx/access.log