Missing virtual name for block device mapping. Launching EC2 instance failed

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I have a little problem with my aws autoscaling. I have my AMI ready and I also have created the launch configuration. I bind my configuration with the autoscaling group. Everything seems to work fine, but then I get the following error report:

Launching a new EC2 instance. Status Reason: Missing virtual name for block device mapping. Launching EC2 instance failed.

I can create an instance of this AMI and it's ok, but with autoscaling does not work. This instance is instance store based, so we don't use any EBS. Maybe I miss something?

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