How to fix exit status 127?

I attempted to follow [this guide](https://certsimple.com/blog/deploy-node-on-linux#node-linux-service-systemd) to run a Node application as a service. However, it is failing to start, with exit code 127. Is there any way to fix this? This is the journal. sudo journalctl --follow -u serviceName -- Logs begin at Tue 2017-08-08 16:27:10 GMT. -- Aug 08 17:06:57 raspberrypi systemd: Started serviceName. Aug 08 17:06:57 raspberrypi app.js: [46B blob data] Aug 08 17:06:57 raspberrypi systemd: serviceName.service: main process exited, code=exited, status=127/n/a Aug 08 17:06:57 raspberrypi systemd: Unit serviceName.service entered failed state. Aug 08 17:06:57 raspberrypi systemd: serviceName.service holdoff time over, scheduling restart. Aug 08 17:06:57 raspberrypi systemd: Stopping serviceName... Aug 08 17:06:57 raspberrypi systemd: Starting serviceName... Aug 08 17:06:57 raspberrypi systemd: serviceName.service start request repeated too quickly, refusing to start. Aug 08 17:06:57 raspberrypi systemd: Failed to start serviceName. Aug 08 17:06:57 raspberrypi systemd: Unit serviceName.service entered failed state. This is the serviceName.service. [Unit] Description=ServiceName After=network.target [Service] ExecStart=/home/pi/projects/ServiceName/app.js Restart=always User=root Group=root Environment=PATH=/usr/bin:/usr/local/bin Environment=NODE_ENV=production WorkingDirectory=/home/pi/projects/ServiceName [Install] WantedBy=multi-user.target This is at the top of my app.js. #!/usr/bin/env node