The NTDS-DSA object: '%1' is not properly configured and is preventing the forest functional level from being raised. It ...

The NTDS-DSA object:
'%1'
is not properly configured and is preventing the forest functional level from being raised. It refers to the Active Directory Domain Controller '%2'. If this AD DC is off-line, then bringing it back on line may cause replication that will repair the configuration. Otherwise delete this object using the ADSI Edit MMC snapin or a similar tool.