DNS Master DB Register Error

[henrywj]

When executing the DNS Master DB Register Error on my running MySql 5.1 Master DB Server, I continuously get the following error: <ErrorResponse xmlns=\"https://route53.amazonaws.com/doc/2010-10-01/\"><Error><Type>Sender</Type><Code>InvalidChangeBatch</Code><Message>FATAL problem: DomainLabelEmpty encountered at db-master.aws.kwaff.com.</Message></Error><RequestId>e8cc5514-66e3-11e1-ba27-5fc1b60d153b</RequestId></ErrorResponse>

Any ideas why? I have the A record defined as db-master.aws.kwaff.com. Using Route53.