Configuration Manager cannot update the already existing object "%1" in Active Directory (%2). Possible cause: The site server's ...

%11Configuration Manager cannot update the already existing object "%1" in Active Directory (%2).

Possible cause: The site server's machine account may not have full control rights for the "System Management" container in Active Directory
Solution: Give the site server's machine account full control rights to the "System Management" container, and all child objects in Active Directory.

Possible cause: The Active Directory object "%1" has been moved to a location outside of the "System Management" container, or has been lost.
Solution: Delete the object from its current location, and let the site create a new object.

Possible cause: The Active Directory schema has not been extended with the correct ConfigMgr Active Directory classes and attributes. 
Solution: Turn off Active Directory publishing for each site in the forest, until the schema can be extended.  The schema can be extended with the tool "extadsch.exe" from the installation media.%0