Amazon ECS: No Fargate configuration exists for given values for Jenkins amazon-ecs-plugin

Question

I am trying to use recently released amazon-ecs-plugin:1.15 which support fargate but I am getting below error.

WARNING: Slave {0} - Cannot create ECS Task
May 24, 2018 1:10:39 PM hudson.slaves.NodeProvisioner$2 run
WARNING: Unexpected exception encountered while provisioning agent ECS Slave ecs-jenkins-slave
com.amazonaws.services.ecs.model.ClientException: No Fargate configuration exists for given values. (Service: AmazonECS; Status Code: 400; Error Code: ClientException; Request ID:****-****)

Here is my config