AWS Data pipeline: No policy attached to the role

Question

I am trying to create a Data pipeline to copy the data from postgres to an s3 bucket. I created an IAM role for the ec2

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "datapipeline:*",
                "ec2:*",
                "rds-db:connect",
                "rds:Describe*",
                "s3:*",
                "sdb:*",
                "sns:*",
                "sqs:*"
            ],
            "Resource": "*"
        }
    ]
}

However, I get the following error: No policy attached to the role - unable to validate policy for 'data-pipeline-ec2-trial'

I know that I need to create an instance profile with EC2 rather than a role with EC2 for Data pipeline.

I was also following this tutorial https://adamtheautomator.com/aws-data-pipelines/