Error while adding an Addon domain in cPanel. (sorry the domain is already pointed to an IP address)

By using the “WHM/cPanel” you can basically handle your accounts in a server. You can make sub-domains, Addon domains, parked domains from the control panel. Here I am describing a fix for the error below while adding an Addon domain.

The domain is already pointed to an IP address that does not appear to use DNS servers associated with this server.

For solving this problem you can use any of the choices below
Option 1: Modify your name servers according to your host’s name servers. It may cause downtime, however, and isn’t really suggested.
Option 2: You can simply solve this problem from your WHM. 
WHM > Tweak Settings > Domains > Allow Remote Domains make sure that this option is checked:

Now you can add new Addon domains those having name servers other than your server.