CloudWatch error with AWS Deep Learning AMI: name can't be prefixed with "ssm"

I'm using the Amazon Deep Learning AMI (ami-07252019da3a8acc8) with Ray using this example: https://github.com/ray-project/ray/tree/master/python/ray/autoscaler/aws/cloudwatch

However, I'm getting this error:

botocore.exceptions.ClientError: An error occurred (ValidationException) when calling the GetParameter operation: Parameter name: can't be prefixed with "ssm" (case-insensitive). If formed as a path, it can consist of sub-paths divided by slash symbol; each sub-path can be formed as a mix of letters, numbers and the following 3 symbols .-_

Is anyone else running into this?