title: AWS CLI returning Unknown options : awsvpcConfiguration
body: <p>When i run the below command on aws-cli its throws an error 'returning Unknown options : awsvpcConfiguration'</p>
  
  <p>e.g</p>
  
  <pre><code>aws ecs run-task --cluster test-ecs-cluster --task-definition testtask --launch-type FARGATE --network-configuration awsvpcConfiguration={subnets=["subnet-1234","subnet-12345"],securityGroups=["test"],assignPublicIp="DISABLED"}
  </code></pre>
  
  <p>i got the below error:</p>
  
  <blockquote>
    <p>Unknown options: awsvpcConfiguration=securityGroups=[test],
    awsvpcConfiguration=assignPublicIp=DISABLED,
    awsvpcConfiguration=subnet-1234]</p>
  </blockquote>