如何在AWS Cloudformation上将SubnetId设置为parameterValue

Question

大家好，我正在使用CloudFormation构建基础架构。我的代码块如下所示。

...
..
.

SubnetId:
  Type: String
  Description: SubnetId of an existing subnet in your Virtual Private 
     Cloud (VPC)

...
..
.
Resources:
MyInstance:
Type: AWS::EC2::Instance

Properties:
  ImageId:
    Fn::FindInMap:
    - AWSRegionArch2AMI
    - Ref: AWS::Region
    - Fn::FindInMap:
      - AWSInstanceType2Arch
      - Ref: InstanceType
      - Arch

  InstanceType:
    Ref: InstanceType
  SubnetId:
    Ref: SubnetId
  SecurityGroupIds:
  - Ref: MyInstanceSecGroup
  KeyName:
    Ref: KeyName

我已经执行了命令

aws cloudformation create-stack --template-body file://ec2.yaml --parameters ParameterKey=SubnetId,ParameterValue=subnet-abcde --stack-name my_instance

因此我在CloudFormation控制台出现如下所示的错误。

The parameter groupName cannot be used with the parameter subnet

如何动态地将subnetId设置为参数。

感谢帮助