[ovirt-users] Failed to delete snapshot <UNKNOWN> for VM

Hi I am getting theese events every minute, any ideas ? Failed to delete snapshot '<UNKNOWN>' for VM 'khk9dsw16' I have tried : Restarting VM Set the host to maintenaince an activated again Restarted ovirt-engine on Manager SW : oVirt Engine Version: 4.0.1.1-1.el7.centos Thanks, Kind regards Peter Calum