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Need help for error, please.

Hello All, following the uper step-by-step tutorial and http://www.saout.de/tikiwiki/tiki-index.php?page=EncryptedDeviceUsingLUKS

when it comes to :

debian:~# cryptsetup luksFormat /dev/hdb12

i got the error :

WARNING!
========
This will overwrite data on /dev/hdb12 irrevocably.

Are you sure? (Type uppercase yes): YES
Enter LUKS passphrase:
Verify passphrase:
Failed to setup dm-crypt key mapping.
Check kernel for support for the aes-cbc-essiv:sha256 cipher spec and verify that /dev/hdb12 contains at least 133 sectors.
Failed to write to key storage.
Command failed.

What i'm suppose to do ? i'm stuck.

I got The Multi-device support (RAID and LVM)(*) -> Device mapper support (*)
in my kernel (2.6.22.3)
I got the Cryptographic options : AES cipher algorithms (*) and AES cipher algorithms (i586) (*) in my kernel (2.6.22.3)

Did i forget something ?

Thanks for any help !

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