Help needed: error booting to btrfs filesystem

[Eugen Dedu]

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/),
which uses I think grub v. 1.98.  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 debian-installer 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 filesystem.
Entering rescue mode...
grub rescue>

What can I do to boot into btrfs?  Cannot grub boot into btrfs?  I
looked for information on Internet with no luck...

-- 
Eugen Dedu