linux – Apache virtual host doesn’t load the index.html file

I wrote httpd.conf file this way but it’s not loading the index.html file.Whenever I type project URL in browser it says this site can’t be reached

      <VirtualHost *:80> 
       ServerName www.linuxhelptesting.com
       DocumentRoot /var/www/html/sample1
      </virtualhost>

what am I doing wrong here. Please help