You specified that you would like to create a DNS delegation in the parent zone but attempts to create the delegation failed. ...

You specified that you would like to create a DNS delegation in the parent zone but attempts to create the delegation failed. This could be because you do not have permissions to do so, or because the DNS Zone/Dns delegation record already exists, or because the zone is hosted by a server that does not run Windows. To ensure that this domain controller can be found by other computers on the network, you must create a DNS delegation in the parent zone for this domain. To do so, contact an administrator who is responsible for the parent DNS zone.