btrfs-convert not working

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http://forums.fedoraforum.org – hi, I wanted to give btrfs a try and therefore tried to convert one of my existing ext4 file systems to btrfs by copying into an image file and doing the test with it. the actual convert did work - at least there was no error: Code: >btrfs-convert test.img creating btrfs metadata. creating ext2fs image file. cleaning up system chunk. conversion complete. however trying to mount the image file I get the following error Code: >mount -t btrfs test.img test mount: wrong fs type, bad option, bad superblock on /dev/loop0,       missing codepage or hel (HowTos)