I'm getting a similar error:
Code:
| 08:12:42 PM | Info | ......COMMAND => Preparing MBP
| 08:14:25 PM | Info | hdiutil: create failed - Operation not supported
| 08:14:25 PM | Error | ****FAILED****: result=256 errno=22 (Unknown error: 0)
Buffalo LS-WSGL/R1 XFS