error: Refusing to undefine while domain managed save image exists

[root@ok libvirt]# virsh undefine win7
error: Refusing to undefine while domain managed save image exists

[root@ok libvirt]# virsh managedsave-remove win7
Removed managedsave image for domain win7
[root@ok libvirt]# virsh list
 Id    Name                           State
----------------------------------------------------
 1     centos01                       running
 2     tiny                           running

[root@ok libvirt]# virsh list --all
 Id    Name                           State
----------------------------------------------------
 1     centos01                       running
 2     tiny                           running
 -     centos02                       shut off
 -     centos03                       shut off
 -     centos04                       shut off
 -     centos05                       shut off
 -     centos06                       shut off
 -     centos07                       shut off
 -     centos08                       shut off
 -     centos09                       shut off
 -     win2003                        shut off
 -     win7                           shut off

[root@ok libvirt]# virsh start win7
Domain win7 started

[root@ok libvirt]# virsh list 
 Id    Name                           State
----------------------------------------------------
 1     centos01                       running
 2     tiny                           running
 7     win7                           running