Trying to create Cardano node not starting

I am trying to install a passive cardano node to testnet and have been instructed by someone running another stake pool in the community. I keep getting this error message, can someone help? Aug 20 19:14:16 davida-U46E systemd[126364]: relay-node.service: Failed to determine user credentials: No such process
Aug 20 19:14:16 davida-U46E systemd[126364]: relay-node.service: Failed at step USER spawning /usr/local/bin/cardano-node: No such process
– Subject: Process /usr/local/bin/cardano-node could not be executed
– Defined-By: systemd


– The process /usr/local/bin/cardano-node could not be executed and failed.

– The error number returned by this process is ERRNO.
Aug 20 19:14:16 davida-U46E systemd[1]: relay-node.service: Main process exited, code=exited, status=217/USER
– Subject: Unit process exited
– Defined-By: systemd

– An ExecStart= process belonging to unit relay-node.service has exited.

– The process’ exit code is ‘exited’ and its exit status is 217.
Aug 20 19:14:16 davida-U46E systemd[1]: relay-node.service: Failed with result ‘exit-code’.
– Subject: Unit failed
– Defined-By: systemd
– Support: Enterprise open source support | Ubuntu

– The unit relay-node.service has entered the ‘failed’ state with result ‘exit-code’.

thank you!