I try to install SLE15SP1, on HPE DL460c G7, using iLO console and Virtual media to mount iso file (to be DVD-ROM)

The installation stops and shows messages below:

"Unable to create repository
from URL 'cd:/?devices=/dev/disk/by-id/usb-HP-Virtual_DVD-ROM-0:0'.

Unknown error reading from 'cd:///?devices=/dev/disk/by-id/usb-HP_Virtual_DVD-ROM-0:0'
- ABORT request: Aborting requested by user
- Failed to mount cd:///?devices=dev/disk/by-id/usb-HP_Virtual_DVD-ROM-0:0 on /var/adm/mount/AP_)xx3PtcT: Mounting media failed (mount: /var/adm/mount/AP_0xx3PtcT: /dev/sr0 alrea

Try again?"

It seems to fail mounting iso file.

How can we fix this issue? Any suggestion will be appreciated.