21215   zERR_ENABLE_ENCRYPTED_VOLUME_NOT_ENABLED

Source:  NSS, Common Layer, Encrypted Volume Support

Explanation:  An attempt was made to enable the Encrypted attribute for an existing nonencrypted volume.

Possible Cause:  One of the following problems could cause this error:

Action:  To encrypt an existing volume, you must create a new encrypted volume, then migrate existing data from the nonencrypted volume to the encrypted volume.