无法通过 cloudformation yaml 创建 AWS::ECS::Service，模型验证失败

在创建期间AWS::ECS::Service通过 cloudformation 我收到错误：Model validation failed

该错误与以下内容有关#HealthCheckGracePeriodSeconds和一些其他属性。错误详细信息是：expected type: Number, found: String.

在 yaml 中它已经是一个数字了。我不清楚出了什么问题。已经尝试将其声明为字符串或数字类型的参数。

我需要一些提示，因为我现在陷入困境。

错误是：

Model validation failed 
    (
    #/HealthCheckGracePeriodSeconds: expected type: Number, found: String 
    #/DesiredCount: expected type: Number, found: String 
    #/DeploymentConfiguration/MaximumPercent: expected type: Number, found: String 
    #/DeploymentConfiguration/MinimumHealthyPercent: expected type: Number, found: String
    )

template.yaml 中的定义是：

ServiceDefinition:
  Type: AWS::ECS::Service
  Properties:
    ServiceName: !Ref ServiceName
    Cluster: !Ref ClusterName
    TaskDefinition: !Ref TaskDefinition
    DeploymentConfiguration:
      MinimumHealthyPercent: 100
      MaximumPercent: 200
    DesiredCount: 1
    HealthCheckGracePeriodSeconds: 60
    LaunchType: FARGATE
    NetworkConfiguration:
      AwsVpcConfiguration:
        AssignPublicIP: ENABLED
        SecurityGroups: !FindInMap [Env2SecurityGroups, !Ref AWS::AccountId, securitygroup]
        Subnets: !FindInMap [Env2PublicSubnets, !Ref AWS::AccountId, subnets]

造成该错误的原因是SecurityGroups and Subnets导致格式错误。

提取subnets and securitygroups the FindInMap使用了函数。这个结果必须是一个列表。这可以通过使用来实现Split功能。

不幸的是，错误的格式会导致完全误导性的错误消息。

像这样声明映射：

Mappings
  Env2SecurityGroups:
    '111111111111':
      securitygroup: 'sg-1111111111111111'
    '222222222222':
      securitygroup: 'sg-2222222222222222'
    '333333333333':
      securitygroup: 'sg-3333333333333333'

  Env2PublicSubnets:
    '111111111111':
      subnets: subnet-1111111111111111,subnet-22222222222222222,subnet-33333333333333333
    '222222222222':
      subnets: subnet-1111111111111111,subnet-22222222222222222,subnet-33333333333333333
    '333333333333':
      subnets: subnet-1111111111111111,subnet-22222222222222222,subnet-33333333333333333

Use !Split结合!FindInMap获取列表：

SecurityGroups: !Split [",", !FindInMap [ Env2SecurityGroups, !Ref AWS::AccountId, securitygroup] ]
Subnets: !Split [",", !FindInMap [ Env2PublicSubnets, !Ref AWS::AccountId, subnets] ]