Showing 500 problem in my site

[shivashrestha]

Username

epiz_22557811 or http://shivshrestha.com.np

(please specify the website or account you are asking about)

my site is not running and it shows the "This page isn’t working

shivshrestha.com.np is currently unable to handle this request.

HTTP ERROR 500"

[Ergastolator1]

Http error 500