command failed:Invalid argument
 

hi all;
I want to use dm-crypt to encrypt, but I run this command:
cryptsetup -y create maildir /dev/sdb1
I get this message:
Command failed: device-mapper: reload ioctl failed: Invalid argument

does /dev/sdb1 exist ?
it must also not be mounted !

Hi did you resolve this?

Please reply to
:
http://www.linuxquestions.org/questions/programming-9/command-failed-device-mapper-reload-ioctl-failed-invalid-argument-736917/