Adprep was unable to check the domain update status. Status/Consequence Adprep queries the directory to see if the domain ...

Adprep was unable to check the domain update status.
[Status/Consequence]
Adprep queries the directory to see if the domain has already been prepared. If the information is unavailable or unknown, Adprep proceeds without attempting this operation. 
[User Action] 
Restart Adprep and check the ADPrep.log file. Verify in the log file that this domain has already been successfully prepared.