Get your smart electric, water and gas meter scm readings into home assistant with a RTL-SDR

Great tutorial. I am working though it. I am able to read my water and gas meter wby using rtlamr, but the problem I am having is registering the service on my raspberry pi. Every time I try to start the service, I get the error:

amridm2mqtt.service: Failed at step EXEC spawning /opt/amridm2mqtt/amrscm2mqtt: Permission denied

Any idea what this would be caused by?

Thanks