lh_build failed suddenly with E: lh_chroot_proc missing

[fboudra at gmail.com (Fathi Boudra)]

Hi,

yesterday, I have done multiple amd64 iso images without problem until I tried 
to redo the iso from scratch.

I used lh_clean purge then lh_build:

P: Begin caching bootstrap stage...
P: Begin bootstrapping system...
E: unsupported variant
P: Begin caching bootstrap stage...
P: Begin caching chroot stage...
P: Begin mounting /proc...
E: lh_chroot_proc missing

I'm on Sid amd64 and create a Sid amd64 image with live-helper snapshot 
1.0~a34~20071030.110252.

any ideas on what's going on ?

cheers,

Fathi