The Vhost is an essential configuration file for a web site to work, if for some reason the Vhost has been deleted or manipulated in a wrong way, the web site will stop working.
This process will correct and recreate again these Vhosts files.
In order to recreate the Virtual Hosts of your hosting service, you will have to access the Dashboard of your service:
And click on the icon to generate the new Virtual Hosts:
A new window will open where you will have to accept the creation of the new virtual hosts: