Starting node server automatically when auto-scaling EC2 does not work

I would like to automatically run node server when instances are created (using forever). I am on Ubuntu 11.10 (Canonical), I followed the instructions here exactly on creating launch config using user script: http://alestic.com/2011/11/ec2-schedule-instance

I can't seem to get this to work. Below is my startup script:

#!/bin/bash                                                                                                                        

set -e -x

/home/MyUserName/node_modules/.bin/forever stopall
/home/MyUserName/node_modules/.bin/forever start node.js/app.js

The launch config is created using this cmd:

as-create-launch-config MyLC --image-id ami-b6a3f8f2 --user-data-file user-data-script.sh --instance-type m1.small