下面是我的 Cloudformation 模板，我想添加多个资源，但出现以下错误
模板包含错误：模板格式错误：YAML 格式不正确。（第 61 行，第 1 列）
AWSTemplateFormatVersion: 2010-09-09
Description: >-
This template creates IoT policy - attaches to a device certificate, IoT Topic
Rule- used to forward messages to sns based on service key, and creates
required IAM roles for these.
Parameters:
vpcname:
Type: String
Description: Enter vpcname
vpcnamefirstletterupper:
Type: String
Description: Enter vpcname with camelcase, ex- "Usdevms"
taaccountid:
Type: String
Description: Enter TA AccountID"
Resources:
IoTDaasDeviceRole:
Type: 'AWS::IAM::Role'
Properties:
RoleName: !Join ["",[IoTDaasDeviceRole.,!Ref vpcname]]
MaxSessionDuration : 43200 …