cPanel Error: Sorry, that domain is already setup (remove it from httpd.conf)

Have you received this error while trying to create an account in your WHM? You will find a lot of long methods to fix it online. However, I was pretty amazed to see the solution is very simple but not discussed anywhere. So I decided to drop a little post.
All you have to do is, run the following commands in the Shell (SSH).

/scripts/rebuildhttpdconf
/scripts/restartsrv_httpd