Invalid or unknown key: launch_template error in EKS Managed Node Group. 0.11 version

I am trying to use launch template as given in terraform document. But i am seeing the above error. Anyone can help here? Thanks in Advance.

======
scaling_config {
desired_size = “{var.workers_instance_count}" max_size = "{var.workers_instance_count + 5}”
min_size = “${var.workers_instance_count}”
}

launch_template {
id = “{aws_launch_template.this.id}" version = "{aws_launch_template.this.latest_version}”
}

Code Above.