Adprep was unable to modify the security descriptor on object %1. Status/Consequence ADPREP was unable to merge the existing ...

Adprep was unable to modify the security descriptor on object %1.
[Status/Consequence]
ADPREP was unable to merge the existing security descriptor with the new access control entry (ACE).
[User Action]
Check the log file ADPrep.log in the %2 directory for more information.