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Error launching a defined domain with XML

Hello, While checkpointing a VM with openstack, i get this error message in nova-compute log : " error launching a defined domain with XML " and this : " ERROR oslo.messaging.rpc.dispatcher [req-8dcd07ef-f019-488f-8904-f44b83659f31 ] Exception during message handling: invalid argument: Backing file '/var/lib/nova/instances/_base/a78d6646a34610a839a9ad2f0cfa4f1df96f1267' of image '/var/lib/nova/instances/89d7324e-49ed-4b87-94d3-5878c908141b/disk' is missing "

So the snapshot didn't work. What can be the problem.

hope to read you. Best regards