[ovirt-users] Backup Ovirt VMs with Python not working

Hello, I have set up Ovirt Backup how it is explained in this link: http://blog.infratic.com/create-ovirtrhevs-vm-backup/ I also have changed the settings on the default.conf. When I started the backup it works until it begins to create the qcow2 file It writes: qemu-img: Could not open '/home/DC01/2019-03-20-20/DC01_Disk1.qcow2': Failed to get shared "write" lock Is another process using the image? Have anyone ideas and can help me? Thanks