Invalid AddressOnParent value (16) for disk with InstanceID=#####
"VMware Cloud Director 10.5.1.1
This is a known issue in where Cloud Director versions prior to 10.6 release which does not support Paravirtual SCSI disk with unit more than 15.
This issue has been fixed in Cloud Director 10.6 and above and an upgrade is required. No workaround available.
This is documentented in the VMware Cloud Director 10.6 Release Notes