Hi Anton,
I found some clue about this problem.
https://github.com/openbmc/bmcweb/blob/b0ad4de61ddd7872894b6f741156104f0a0c0ee6/redfish-core/lib/virtual_media.hpp#L1062
In virtual_media.hpp, the ObjectMapper failed because it cannot find the "/xyz/openbmc_project/VirtualMedia” object path.
So the problem is why there is no such object available ?
Do I need to start any service that depends by virtual media ?

Thanks
From: Anton Kachalov <rnouse@google.com>
Sent: Thursday, October 8, 2020 3:19 AM
To: Brad Chou <bradc@hyvedesignsolutions.com>
Cc: openbmc@lists.ozlabs.org
Subject: Re: Redfish Virtual Media return InternalError


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Hey, Brad.

Try to log into the bmc and check the bmcweb logs:

# systemctl status -n 100 bmcweb.status

If it doesn't show anything meaningful, get the "Main PID" and try to strace it (you need to include strace into the builded image).

On Tue, 6 Oct 2020 at 11:20, Brad Chou <bradc@hyvedesignsolutions.com<mailto:bradc@hyvedesignsolutions.com>> wrote:
Hi,
I enable the “DBMCWEB_ENABLE_VM_NBDPROXY” flag in bmcweb by bbappend it :
EXTRA_OECMAKE_append = " \
    -DBMCWEB_ENABLE_VM_NBDPROXY=ON \
"

Then try to use redfish virtual media.
But I got an error return when get into the collection :

$  curl -k -H "X-Auth-Token: $token" https://${bmc}/redfish/v1/Managers/bmc/VirtualMedia<https://$%7bbmc%7d/redfish/v1/Managers/bmc/VirtualMedia>
{
  "@odata.id<http://odata.id>": "/redfish/v1/Managers/bmc/VirtualMedia/",
  "@odata.type": "#VirtualMediaCollection.VirtualMediaCollection",
  "Name": "Virtual Media Services",
  "error": {
    "@Message.ExtendedInfo": [
      {
        "@odata.type": "#Message.v1_0_0.Message",
        "Message": "The request failed due to an internal service error.  The service is still operational.",
        "MessageArgs": [],
        "MessageId": "Base.1.4.0.InternalError",
        "Resolution": "Resubmit the request.  If the problem persists, consider resetting the service.",
        "Severity": "Critical"
      }
    ],
    "code": "Base.1.4.0.InternalError",
    "message": "The request failed due to an internal service error.  The service is still operational."
  }
}


Any idea ?