我有一个已部署在AWS Elastic Beanstalk上的Rails应用程序，并且正在尝试将ElastiCache添加到其中。我遵循了instructions，但是在尝试部署时遇到以下错误：
Uploading: [##################################################] 100% Done...
2018-08-14 18:19:52 INFO Environment update is starting.
2018-08-14 18:20:15 ERROR Service:AmazonCloudFormation, Message:Stack named 'awseb-e-blabla-stack' aborted operation. Current state: 'UPDATE_ROLLBACK_IN_PROGRESS' Reason: The following resource(s) failed to create: [MyElastiCache].
2018-08-14 18:20:15 INFO Created security group named: awseb-e-blabla-stack-MyCacheSecurityGroup-blabla
2018-08-14 18:20:15 ERROR Failed to deploy application.
如何缩小导致“ MyElasticCache”创建失败的原因？我在这里缺少配置设置吗？