is it a Xen strange behavior or a NetBSD one?

[erinlalouve%free.fr@localhost]

hi everyone,

I'm installing a xen server on a new big toy with some VM, but after using the 
same script, based on the netbsd1 example, that I adapt everytime (name, mac 
address, disk path), I have a strange behavior. the method worked perfectly the 
first 3 times but give me an error the fourth:

Error: Device 0 (vif) could not be connected. Hotplug scripts not working.

and here are the log:

Failed to read /local/domain/0/backend/console/1/0/script (No such file or 
directory)
Failed to read /local/domain/0/backend/console/2/0/script (No such file or 
directory)
Failed to read /local/domain/0/backend/console/3/0/script (No such file or 
directory)
xenstore-read: couldn't read path /local/domain/0/backend/vif/4/0/bridge
xenstore-read: couldn't read path /local/domain/0/backend/vif/4/0/bridge
Failed to read /local/domain/0/backend/console/4/0/script (No such file or 
directory)
Failed to read /local/domain/0/backend/console/4/0/script (No such file or 
directory)
xenstore-read: couldn't read path /local/domain/0/backend/vif/5/0/bridge
Failed to read /local/domain/0/backend/console/5/0/script (No such file or 
directory)
Failed to read /local/domain/0/backend/console/5/0/script (No such file or 
directory)
xenstore-read: couldn't read path /local/domain/0/backend/vif/6/0/bridge
Failed to read /local/domain/0/backend/console/6/0/script (No such file or 
directory)
Failed to read /local/domain/0/backend/console/6/0/script (No such file or 
directory)

I use a NetBSD 5.1_RC1 amd64 has Dom0 and DomU but I tried with 5.0.2 and I 
have the same problem with exactly the same log file.

Don't know what to do... Is it an hardware/software limitation that I forget to 
change, or something else?

Thank you