I am getting Account Creation Status Failed Error while Adding the Domain In My WHM

Error :

Account Creation Status Failed . A DNS entry for “domainname” already exists. You
must remove this DNS entry from all servers in the DNS cluster to
proceed.

Reason :  

The Username is already exists in the server or DNS zone for the domain was existing in the server which you are trying to create in the WHM.

Solution :

Contact the hosting service provider and ask them to remove the DNS entry and then you can proceed for that domain creation in WHM.