If you encountered a CREATE_FAILED error when you launch the Quick Start, we recommend that you relaunch the template with Rollback on failure set to No. (This setting is under Advanced in the AWS CloudFormation console Options page.) With this setting, the stack’s state will be retained and the instance will be left running, so you can troubleshoot the issue.
When you set Rollback on failure to No, you will continue to incur AWS charges for this stack. Ensure you delete the stack when you finish troubleshooting.