Error: "Active Directory Domain Services could not find another Active Directory Domain Controller to transfer the remaining data in directory partition DC=Staging,DC=gpoadmin". (4371406)

Error: "Active Directory Domain Services could not find another Active Directory Domain Controller to transfer the remaining data in directory partition DC=Staging,DC=gpoadmin".

Performing a DC demotion, and receiving an operation failure. Error is "Active Directory Domain Services could not find another Active Directory Domain Controller to transfer the remaining data in directory partition DC=Staging,DC=gpoadmin".

DC=Staging,DC=gpoadmin is an application partition used by GPOAdmin for GPO Modeling reports. Application partitions are not replicated to all the DCs like normal domain partition is. You will need to add another DC as a replica, allow enough time for the replication to occur and then remove the DC that you are trying to demote:

1- Open an elevated Command Prompt 
2- Type: ntdsutil
3- At the ntdsutil command prompt, type: domain management or partition management
4- At the domain management command prompt, type: connection
5- At the server connections command prompt, type: connect to server ServerName (where ServerName is the name of the DC that you want to have the partition)
6- At the server connections command prompt, type: quit
7- At the domain management command prompt:
▪ For every domain controller which might be used to run the Group policy modeling report on, type the following: add nc replica “dc=staging,dc=gpoadmin” DomanControllerName (where DomainControllerName is the DC to have the partition added to)
▪ To delete the partition on the server to be demoted:
remove nc replica “dc=staging,dc=gpoadmin” DomainControllerName (where DomainControllerName is the DC that you want to demote)