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Ironic: No valid host found when try to boot an image

I installed Ironic through devstack successfully.

When I try to boot a image through nova boot command it's showing that

Error building server ERROR (InstanceInErrorState): No valid host was found. Exceeded max scheduling attempts 3 for instance fd194c92-b0c7-43d1-89ec-b6bf94fc2a59. Last exception: [u'Traceback (most recent call last):\n', u' File "/opt/stack/nova/nova/compute/manager.py", line 2014, in do_build_and_run_ins

please help me on this. I am unable to find what is the error.