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Returning exception Block Device Mapping is Invalid

I have setup cinder with GlusterFSbackend. It's working fine. Then I created a new volume. But when I tried to launch new instance with that vlume by boot from volume option it failed. I got this error from nova-compute.log. Any idea?

ERROR oslo.messaging._drivers.common [-] Returning exception Block Device Mapping is Invalid.
File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1699, in _prep_block_device\n    raise exception.InvalidBDM()\n', 'InvalidBDM: Block Device Mapping is Invalid.\n']