When I do this command appeared this error: Error: Device 0 (vif) could not be connected. Hotplug scripts not working.

My virtual machine configuration is: http://pastebin.com/b1rhCZHz

My /etc/xen/xen-config.sxp : http://pastebin.com/uiHXSvWM

I have add in the mkinitcipio these modules: i915 xen-blkfront xen-evtchn xen-netback xen-blkback

I think that the error is produced by udev (the lastest udev can be incompactible with the xen version) because I read this archlinux's forum: https://bbs.archlinux.org/viewtopic.php?id=111879