The functional level of the local domain controller, as indicated by its NTDS Settings object, is higher than the functional level that is supported by the operating system.
The current functional level of the local domain controller as indicated by its NTDS Settings object is incompatible with the operating system because the functional level is set higher than the functional level supported by this operating system.
Functional level based on NTDS Settings object: %1
Functional level supported by the operating system: %2
Install the correct operating system on this domain controller.
For more information, see:
Microsoft Help and Support for Microsoft Windows Server 2008 and above
Microsoft Knowledge Base