[Live-boot]problem with wheezy and not with squeeze

[leyoy@free.fr]

Good night,

I try to build a wheezy but when i launch it in virtual box it says:
module i8042 and atkbd not found ...
if i look for the log I see:
live-boot:W: live-boot-initramfs-tools (backend) installed without live-boot,

W: this initramfs will *NOT* have live support.
if i do the same thing in squeeze there is no problem ...
I try differents mirrors but same issue for me, 1 week ago there was no problem ...

What's wrong ?

Thanks for your help