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Driver failed to attach volume

I setup Juno with Ceph and created a volume thru Horizon. I can see the volume created in Ceph but when failing when try to attach to CirrOS instance. Following errors noticed in nova-compute.log in the compute node.

2015-09-11 11:35:29.690 5050 ERROR nova.virt.libvirt.driver [req-92952039-9cf7-49e0-a962-6fa72c77df86 None] [instance: 47763b7c-c10d-42e0-a769-9f70d7d0b05e] Failed to attach volume at mountpoint: /dev/vdc 2015-09-11 11:35:29.722 5050 ERROR nova.virt.block_device [req-92952039-9cf7-49e0-a962-6fa72c77df86 None] [instance: 47763b7c-c10d-42e0-a769-9f70d7d0b05e] Driver failed to attach volume b544cd1c-a18c-43a6-b2e3-8f54db8c2daa at /dev/vdc 2015-09-11 11:35:29.809 5050 ERROR nova.compute.manager [req-92952039-9cf7-49e0-a962-6fa72c77df86 None] [instance: 47763b7c-c10d-42e0-a769-9f70d7d0b05e] Failed to attach b544cd1c-a18c-43a6-b2e3-8f54db8c2daa at /dev/vdc 2015-09-11 11:35:29.945 5050 ERROR oslo.messaging.rpc.dispatcher [req-92952039-9cf7-49e0-a962-6fa72c77df86 ] Exception during message handling: Argument must be bytes or unicode, got 'NoneType'

Any suggestions?

Driver failed to attach volume

I setup Juno with Ceph and created a volume thru Horizon. I can see the volume created in Ceph but when failing when try to attach to CirrOS instance. Following errors noticed in nova-compute.log in the compute node.

2015-09-11 11:35:29.690 5050 ERROR nova.virt.libvirt.driver [req-92952039-9cf7-49e0-a962-6fa72c77df86 None] [instance: 47763b7c-c10d-42e0-a769-9f70d7d0b05e] Failed to attach volume at mountpoint: /dev/vdc
2015-09-11 11:35:29.722 5050 ERROR nova.virt.block_device [req-92952039-9cf7-49e0-a962-6fa72c77df86 None] [instance: 47763b7c-c10d-42e0-a769-9f70d7d0b05e] Driver failed to attach volume b544cd1c-a18c-43a6-b2e3-8f54db8c2daa at /dev/vdc
2015-09-11 11:35:29.809 5050 ERROR nova.compute.manager [req-92952039-9cf7-49e0-a962-6fa72c77df86 None] [instance: 47763b7c-c10d-42e0-a769-9f70d7d0b05e] Failed to attach b544cd1c-a18c-43a6-b2e3-8f54db8c2daa at /dev/vdc
2015-09-11 11:35:29.945 5050 ERROR oslo.messaging.rpc.dispatcher [req-92952039-9cf7-49e0-a962-6fa72c77df86 ] Exception during message handling: Argument must be bytes or unicode, got 'NoneType'

'NoneType'

Any suggestions?