I am trying to Whitelist Amazon EC2 security groups (AWS only) and followed this link http://docs.mongolab.com/security/
I am getting this error "You may not define rules between a VPC group and a non-VPC group".
I searched on the internet about this and found this is an issue of EC2-Classic vs EC2-VPC. If you created your account after 2013-12-04, it supports EC2-VPC only.
So how can I add security group of amazon here. And my security group is also in us-east-1