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CloudFormationでProperty DeviceIndex cannot be empty. が出る場合

CloudFormationでProperty DeviceIndex cannot be empty.のエラーが出る場合があります。
AWS CloudFormation デザイナーで吐かれた↓のようなyamlで再現。

  ...

  EC2I3K8WP:
    Type: 'AWS::EC2::Instance'
    Properties:
      ImageId: ami-bec974d8
      NetworkInterfaces:
        - SubnetId: !Ref PNSubNet1
  ...

対応

インスタンスにSubnetIdを紐付けたかったので以下のように修正。

  ...

  EC2I3K8WP:
    Type: 'AWS::EC2::Instance'
    Properties:
      ImageId: ami-bec974d8
      SubnetId: !Ref PNSubNet1
  ...

備考

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2
Help us understand the problem. What are the problem?