Hello
This error indicates that file system or registry key permissions have been changed and the servicing stack does not have the required access level.
Go to %Windir%\logs\CBS, open the last CBS.log and search for and match with the timestamp. After finding the error, scroll up and try to determine what caused the access denial. It could be access denied to a file, registry key. Determine what object needs the right permissions and change the permissions as needed.
Hope above information can help you.