zfs vm not starting

I've just built a new proxmox node using the 5.0 build It is based on an array of 3 x 3tb RAIDZ-1 ZFS. However when I try to start m yfirst VM, it fails this way: kvm: -drive file=/dev/zvol/rpool/data/vm-100-disk-1,if=none,id=drive-virtio0,format=raw,cache=none,aio=native,detect-zeroes=on...