Active Directory could not rebuild a number of indices.
The subRefs attribute on the following domain object has a value that does not correspond to a valid object. This will prevent Active Directory from functioning normally.
Domain object: %1
Error value:%3 %4
Run the semantic database analysis option in the Ntdsutil command-line tool to correct the problem.
For more information, see:
Microsoft Help and Support for Microsoft Windows Server 2008 and above
Microsoft Knowledge Base