Error while Removing Name serversfromWHM ICANN error

Cannot be removing since it is still registered with an ICANN register.
http://forums.spry.com/archive/index.php/t-150.html
http://www.fdcservers.net/vbulletin/archive/index.php/t-1012.html
http://layer0.layeredtech.com/archive/index.php?t-3666.html
Recently I have seen several instances of the following error in WHM:
"Sorry, the nameserver ip a.b.c.d cannot be removing since it is still registered with an ICANN register."
This error occurs under "Networking Setup -> Nameserver IPs" when you click the X to remove a nameserver.
This is caused by WHM doing whois lookups to determine if the nameservers are registered or not.
To correct the issue, go to Server Configuration -> Tweak Settings and check the box labeled "Disable whois lookups for the nameserver ip manager.".
Save the changes and you should be able to remove the nameserver now.