ceph-deploy osd activate error

[ceph@ceph-client ~]$ ceph-deploy disk list ceph-node1
[ceph_deploy.sudo_pushy][DEBUG ] will use a remote connection with sudo
[ceph_deploy.lsb][WARNIN] lsb_release was not found - inferring OS details
[ceph_deploy.osd][INFO  ] Distro info: CentOS 6.4 Final
[ceph_deploy.osd][DEBUG ] Listing disks on ceph-node1...
[ceph-node1][INFO  ] Running command: ceph-disk list
[ceph-node1][INFO  ] /dev/sda :
[ceph-node1][INFO  ]  /dev/sda1 other, ext4, mounted on /boot
[ceph-node1][INFO  ]  /dev/sda2 other, LVM2_member
[ceph-node1][INFO  ] /dev/sdb :
[ceph-node1][INFO  ]  /dev/sdb1 ceph data, active, cluster ceph, osd.0, journal /dev/sdb2
[ceph-node1][INFO  ]  /dev/sdb2 ceph journal, for /dev/sdb1
[ceph-node1][INFO  ] /dev/sdc :
[ceph-node1][INFO  ]  /dev/sdc1 ceph data, active, cluster ceph, osd.1, journal /dev/sdc2
[ceph-node1][INFO  ]  /dev/sdc2 ceph journal, for /dev/sdc1
[ceph-node1][INFO  ] /dev/sr0 other, iso9660, mounted on /media/VBOXADDITIONS_4.2.18_88780
[ceph@ceph-client ~]$
[ceph@ceph-client ~]$
[ceph@ceph-client ~]$
[ceph@ceph-client ~]$
[ceph@ceph-client ~]$
[ceph@ceph-client ~]$
[ceph@ceph-client ~]$
[ceph@ceph-client ~]$ ceph-deploy osd activate ceph-node1:/dev/sdb
[ceph_deploy.osd][DEBUG ] Activating cluster ceph disks ceph-node1:/dev/sdb:
[ceph_deploy.sudo_pushy][DEBUG ] will use a remote connection with sudo
[ceph_deploy.osd][DEBUG ] Activating host ceph-node1 disk /dev/sdb
[ceph_deploy.lsb][WARNIN] lsb_release was not found - inferring OS details
[ceph_deploy.osd][DEBUG ] Distro CentOS codename Final, will use sysvinit
Traceback (most recent call last):
  File "/usr/bin/ceph-deploy", line 21, in <module>
    sys.exit(main())
  File "/usr/lib/python2.6/site-packages/ceph_deploy/util/decorators.py", line 83, in newfunc
    return f(*a, **kw)
  File "/usr/lib/python2.6/site-packages/ceph_deploy/cli.py", line 147, in main
    return args.func(args)
  File "/usr/lib/python2.6/site-packages/ceph_deploy/osd.py", line 364, in osd
    activate(args, cfg)
  File "/usr/lib/python2.6/site-packages/ceph_deploy/osd.py", line 271, in activate
    cmd=cmd, ret=ret, out=out, err=err)
NameError: global name 'ret' is not defined
[ceph@ceph-client ~]$