title: All my AWS datapipelines have stopped working with Validation error
body: <p>I use AWS data pipelines to automatically back up dynamodb tables to S3 on a weekly basis.<br>
  All of my data-pipelines, have stopped working since two weeks ago.   </p>
  
  <p>After some investigation, I see that EMR fails with "validation error" and "Terminated with errors No active keys found for user account". As a results all the jobs timeout.</p>
  
  <p>Any ideas what this means?<br>
  I ruled out changes to the list of instant types that are allowed to be used with EMR.<br>
  Also I tried to read the EMR logs but it looks like it doesn't event get to the point to create logs (or I am looking for them in the wrong place).</p>