Adprep was unable to update domain information. Status/Consequence Adprep requires access to existing domain-wide information ...

Adprep was unable to update domain information. 
[Status/Consequence]
Adprep requires access to existing domain-wide information from the infrastructure master in order to complete this operation.
[User Action] 
Check the log file, ADPrep.log, in the %1 directory for more information.