Error when using ec2_asg

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Hello all,

I am trying to create an Auto-Scaling Group using ansible. This is
the playbook:

$ tail -n +1 auto.scaling.group.yml
- hosts: localhost
  connection: local
  gather_facts: False

  tasks:
    - name: create auto-scaling group
      ec2_asg:
        name: "MRA"
        launch_config_name: "mail-relay - ansible"
        region: "eu-west-1"
        availability_zones: [ 'eu-west-1a', 'eu-west-1b', 'eu-west-1c' ]
        vpc_zone_identifier: [ 'subnet-8cfaf2ab']
        min_size: 0
        max_size: 10
        desired_capacity: 0

However, when I run it with this command:

$ ansible-playbook auto.scaling.group.yml -vvv

I get this error:
...
failed: [localhost] => {"failed": true}
msg: BotoServerError: 400 Bad Request
<ErrorResponse xmlns="http://autoscaling.amazonaws.com/doc/2011-01-01/&quot;&gt;
  <Error>
    <Type>Sender</Type>
    <Code>ValidationError</Code>
    <Message>The subnet ID '['subnet-8cfaf2ab']' does not exist</Message>
  </Error>
  <RequestId>90ee5366-a20d-11e4-b9e5-294dcdf4fd56</RequestId>
</ErrorResponse>

FATAL: all hosts have already failed -- aborting
...

That subnet does exist as I did a copy/paste straight from an ASG that
I created by hand.

I suspect my error may be elsewhere, but I am not seeing it. Any
thoughts on what I am doing wrong?

Regards,
- Robert