GPT PMBR size mismatch

[defencedog]

I have x2 Sandisk cards both 64GB however it seems they are slightly different...

Booted disk: mmcblk1 63.9GB                Destination disk: sdb 63.9GB
---------------------------------------------------------------------------
Part      Size    FS     Label           Part   Size    FS  Label
1 /boot   256.0M  fat16  --              1       59.5G  --  --
2 root     59.2G  ext4   armbi_root                     
---------------------------------------------------------------------------
== Initialize: IMAGE partition table - partition number mismatch: 2 -> 1 ==
1 /boot               (167.0M used)  : MKFS  SYNC to sdb1
2 root                (28.8G used)   : RESIZE  MKFS  SYNC to sdb2
---------------------------------------------------------------------------
Run setup script       : no.
Verbose mode           : no.
-----------------------:
** WARNING **          : All destination disk sdb data will be overwritten!
-----------------------:

Initialize and clone to the destination disk sdb?  (yes/no): yes
Optional destination ext type file system label (16 chars max):

Initializing
  Imaging past partition 1 start.
  => dd if=/dev/mmcblk1 of=/dev/sdb bs=1M count=20 ...
  Resizing destination disk last partition ...
    Resize failed.  See /tmp/rpi-clone-output.
    Try running rpi-clone again.

GPT PMBR size mismatch (124780543 != 124735487) will be corrected by write.

When I repeat this error happens

Error: Invalid argument during seek for read on /dev/sdb