custome kms_key_id get error while using in launch_block_device_mappings in amzon-ebs builder

[vrushabh]

packer versoin 1.0.4

Builder type : amazon-ebs

I am following this docs: https://www.packer.io/docs/builders/amazon-ebs.html#block-devices-configuration

 "launch_block_device_mappings": [{

            "device_name": "/dev/sda1",

            "volume_type": "gp2",

            "volume_size": 30,

            "encrypted": true,

            "kms_key_id": "12-aa-12-aa-12",

            "delete_on_termination": true

      }]

1 error(s) occurred:

* unknown configuration key: "launch_block_device_mappings[0].kms_key_id"
Build step 'Execute shell' marked build as failure

What is wrong in above code block?

[Rickard von Essen]

You'r using a really old version of Packer. Try upgrading to a more recent version.

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