Adprep detected that the logon user is not a member of the following group: Schema Admins Group. Status/Consequence Adprep ...

Adprep detected that the logon user is not a member of the following group: Schema Admins Group.
[Status/Consequence]
Adprep has stopped without making changes.
[User Action] 
Verify the current logged on user is a member of Enterprise Admins group, Schema Admins group and %1\Domain Admins group.