使用AWS CloudFormation json创建堆栈时，AWS：：Route 53：：RecordSet中出现无效请求错误。错误如下：
创建失败AWS：：路由53：：记录集ApiRecordSet无效请求
下面是ApiRecordSet：

"ApiRecordSet" : {
      "Type" : "AWS::Route53::RecordSet",
      "Properties" : {
        "AliasTarget" :{
          "DNSName": {"Fn::GetAtt" : ["RestELB", "CanonicalHostedZoneName"]},
          "HostedZoneId": {"Fn::GetAtt": ["RestELB", "CanonicalHostedZoneNameID"]}
        },
        "HostedZoneName" : "some.net.",
        "Comment" : "A records for my frontends.",
        "Name" : {"Fn::Join": ["", ["api",{"Ref": "Env"},".some.net."]]},
        "Type" : "A",
        "TTL" : "300"
      }
    }

此请求中有什么错误/无效？