After reboot OMV KVM doesn't see USB-device

Actually, an error occurs which I don't know how to interpret or to solve. Does anybody know what I can do?

Restart was done after installing 702-2.

7.0.2-2 (Sandworm)

Processor
Intel(R) N100

Kernel
Linux 6.1.0-18-amd64

It concerns a Zigbee stick which can be 'seen' in KVM add USB device, see att. It used to work. Now the KVM cannot start because of the error.

Failed to add USB device.
error: Failed to attach device from /tmp/virsh_usbJjW3uV
error: Requested operation is not valid: device is already in the domain configuration
virsh attach-device --domain homeassistant --file '/tmp/virsh_usbJjW3uV' --persistent --config

OMV\Exception: Failed to add USB device.
error: Failed to attach device from /tmp/virsh_usbJjW3uV
error: Requested operation is not valid: device is already in the domain configuration
virsh attach-device --domain homeassistant --file '/tmp/virsh_usbJjW3uV' --persistent --config in /usr/share/openmediavault/engined/rpc/kvm.inc:3298
Stack trace:
#0 /usr/share/openmediavault/engined/rpc/kvm.inc(2206): OMVRpcServiceKvm->virshCommand()
#1 [internal function]: OMVRpcServiceKvm->addUsb()
#2 /usr/share/php/openmediavault/rpc/serviceabstract.inc(122): call_user_func_array()
#3 /usr/share/php/openmediavault/rpc/rpc.inc(86): OMV\Rpc\ServiceAbstract->callMethod()
#4 /usr/sbin/omv-engined(535): OMV\Rpc\Rpc::call()
#5 {main}

Thx, for the reply. It is not possible to start the VM because of the error. Also the 'remove USB' option is greyed out, nothing to delete. Deleting /tmp/virsh_usbJjW3uV doesn't do anything also. After trying to start the VM it pops up with a different name but no success in starting.

Tried also to unplug the device, restart: no result.

Restored the OS: to previous version OMV: same error.

Restored snapshot VM: same error.

Any other ideas, someone? What does the error means and how to solve this? Thx in advance

Correct, deleting the snapshots activated the 'remove USB' button - but it is empty, no device to remove. Adding the USB device gives

500 - Internal Server Error
Failed to add USB device. error: Failed to attach device from /tmp/virsh_usb9zqXgE error: Requested operation is not valid: device is already in the domain configuration virsh attach-device --domain homeassistant --file '/tmp/virsh_usb9zqXgE' --persistent --config

Still not able to start KVM, same error as in post #1

Any other suggestions welcome or else I will have to setup the complete Homeassistant again, good exercise

(hope that that is a solution also - but a lot of work).

Aha! Because of the snapshots I was not able to see the XML, now I do. I have deleted the hostdev part and now HA is up and running again, including the Zigbee stick (added again). Saves me a lot of work and only missing 1 day of data.

Thx to both of you!

BTW: besides a snapshot I also had a recent backup which I restored.

Main lesson learned was indeed the information about the snapshot. Wiki: so far so good.

XML-editing (understanding) for me was quite difficult, learned also a lot from this thread about passtrough. You can do so much with KVM XML, how far to go with explaining on a Wiki for OMV? Explaining basic use seems fine to me. Know the options of the plugin and the rest is this forum or Google.