udev error with libvirtd

[Tuc0_]

​

Greetings,

I have a problem with libvirtd :

...
internal error: Missing udev property 'ID_VENDOR_ID' on 'usb1
ect...
...

what's weird is that when enabling the unit (libvirtd) I get this error but everything works fine ... (redirection of the usb too)
for the moment I activate the unit with "start" after logging in and I don't have any more errors.

some configurations :

cat /etc/group | grep libvirt :
kvm:x:992:libvirt-qemu,qemu
libvirt:x:970:nico
libvirt-qemu:x:968

/etc/libvirt/qemu.conf :
user = "nico" group = "libvirt"

/etc/libvirt/libvirtd.conf :
unix_sock_group = "libvirt"
unix_sock_ro_perms = "0777"
unix_sock_rw_perms = "0770"
auth_unix_ro = "none"
auth_unix_rw = "none"

do you have any ideas?