running the sample app as a windows service using NSSM

The sample to receive a message works great when calling node from the command line.
Would you know why it would not work when trying to turn it into a windows service (am using NSSM)? 
I don't get any errors to trace what could be going wrong:
http://stackoverflow.com/questions/43033778/using-nssm-to-create-a-node-script-cant-be-started