title: Status only changing to ROLLBACK_COMPLETE from CREATE_IN_PROGRESS while trying to create a stack on CloudFormation
body: <p>I am simply trying to create a stack(Name: wordpress) on cloud formation via the AWS console (region N. virginia) by specifying an 
  amazon S3 template URL (<a href="https://s3.amazonaws.com/awsinaction/chapter2/template.json" rel="nofollow noreferrer">https://s3.amazonaws.com/awsinaction/chapter2/template.json</a>) and putting the keyName as "mykey" in the parameter section. Also, I'm providing values for the Key(system) and Value(wordpress) fields in tag section. Every time after I am clicking the create button on Review Page, the status is transitioning to ROLLBACK_COMPLETE from CREATE_IN_PROGRESS. The status reason showing is "Parameter validation failed: parameter value for parameter name KeyName does not exist. Rollback requested by user".</p>
  
  <p>I know I am missing out something very prominent but can't figure out what. Any help on this would be great, I am trying to replicate an example from oreily amazon web service in action, chapter 2.</p>