/usr/bin/env: ruby_executable_hooks: No such file or directory

I'm trying to create a systemctl service that would start a ruby on rails application on server reboot

the following command in a run.sh file

#!/bin/sh
service httpd stop
rails s -p 80 -d 

works on the command line. However when systemctl attempts it I get the subject error. What is the cause of such error and what can I do to stop it?