Adprep was unable to check the current user's group membership. Status/Consequence Adprep has stopped without making changes. ...

Adprep was unable to check the current user's group membership. [Status/Consequence]  Adprep has stopped without making changes. [User Action]  Verify the current logged on user is a member of Domain Admins group, Enterprise Admins group and Schema Admins group if /forestprep is specified, or is a member of Domain Admins group if /domainprep is specified.