Sorry, a DNS entry already exists, please delete it first (from all servers in the dns cluster) - WHM
Sorry, a DNS entry for domainname.com already exists, please delete it first (from all servers in the dns cluster)
This means that a DNS Zone File already exists for this domain. Simply click to the "Delete a DNS Zone" link (in the WHM left-hand menu) and remove the domain name you are trying to add. Now you can reattempt the account creation.
If you still need assistance, feel welcome to contact Microhosting so we can help.