Help needed: error booting to btrfs filesystem

[Eugen Dedu <Eugen.Dedu@pu-pm.univ-fcomte.fr>]

Hi,

I have a new computer with SSD disk.  I installed today debian sid with
debian-installer (daily image from 22 March, the latest available now,
http://cdimage.debian.org/cdimage/daily-builds/daily/arch-latest/amd64/iso-cd/).
 I have only one partition.  I prefer to use btrfs for it.

So (according to http://www.howtoforge.com/boot-on-btrfs-with-debian and
another page), after successful debian installation with ext3, I booted
on d-i CD and:
- I downloaded btrfs-convert and the other btrfs utilities
- I replaced UUID=... with /dev/sda1 in /boot/grub/grub.cfg and /etc/fstab
- and converted ext3 to btrfs according to the page above.

Now, when I boot, I receive:
GRUB loading.
Welcome to grub!

error: unknown filesyste.
Entering rescue mode...
grub rescue>

What can I do to boot into btrfs?  Cannot grub from debian boot into
btrfs?  I looked over Internet with no luck...

-- 
Eugen Dedu