title: ECS Error: "The closest matching container-instance is missing an attribute required by your task"
body: <p>I have created a ECS Service, which is not able to run any tasks in the EC2 containers. I keep getting this message under the "Events" tab for Service.</p>
  
  <pre><code>service QA-SVC was unable to place a task because no container instance met all of its requirements. The closest matching container-instance f84f8418-2b63-4d02-ac5f-2ee3860d4fac is missing an attribute required by your task.
  </code></pre>
  
  <p>I have read almost all the question thread in SO, but I am not able to figure out the cause of this error. The error message does not clearly explain the specific attribute that is missing (or mismatching). I do not know what is in EC2 that I need to configure for the tasks to run on it. </p>