btrfs-convert won't convert ext* - No valid Btrfs found on /dev/sdb1

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Hello guys, i try to convert ext4 volume, but btrfs-convert show me error:
"No valid Btrfs found on file
unable to open ctree
conversion aborted."
Ubuntu 13.04
Kernel: 3.11
btrfs-progs git version 0.20-git20130822~194aa4a13

way to reproduce error:
$ truncate -s 4G file
$ mkfs.ext4 file #say yes to create fs on non block device.
$ btrfs-convert file
 No valid Btrfs found on file
 unable to open ctree
 conversion aborted.

With best regards,
Timofey.
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